| Base | Representation |
|---|---|
| bin | 10010000101110101010… |
| … | …011101011101011001000 |
| 3 | 11101211221200210121011000 |
| 4 | 102011311103223223020 |
| 5 | 130332100143024230 |
| 6 | 2351042514535000 |
| 7 | 155550664413540 |
| oct | 22056523535310 |
| 9 | 4354850717130 |
| 10 | 1243213642440 |
| 11 | 43a275766280 |
| 12 | 180b39897460 |
| 13 | 903083a4533 |
| 14 | 44259832320 |
| 15 | 225138b7b60 |
| hex | 121754ebac8 |
1243213642440 has 512 divisors, whose sum is σ = 5180018688000. Its totient is φ = 257659315200.
The previous prime is 1243213642427. The next prime is 1243213642453. The reversal of 1243213642440 is 442463123421.
1243213642440 is a `hidden beast` number, since 1 + 2 + 4 + 3 + 2 + 1 + 3 + 642 + 4 + 4 + 0 = 666.
It is an interprime number because it is at equal distance from previous prime (1243213642427) and next prime (1243213642453).
It is a Harshad number since it is a multiple of its sum of digits (36).
It is a junction number, because it is equal to n+sod(n) for n = 1243213642395 and 1243213642404.
It is an unprimeable number.
It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 32330025 + ... + 32368455.
It is an arithmetic number, because the mean of its divisors is an integer number (10117224000).
Almost surely, 21243213642440 is an apocalyptic number.
1243213642440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 1243213642440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2590009344000).
1243213642440 is an abundant number, since it is smaller than the sum of its proper divisors (3936805045560).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1243213642440 is a wasteful number, since it uses less digits than its factorization.
1243213642440 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 38858 (or 38848 counting only the distinct ones).
The product of its (nonzero) digits is 110592, while the sum is 36.
Adding to 1243213642440 its reverse (442463123421), we get a palindrome (1685676765861).
The spelling of 1243213642440 in words is "one trillion, two hundred forty-three billion, two hundred thirteen million, six hundred forty-two thousand, four hundred forty".
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