| Base | Representation |
|---|---|
| bin | 100100010011001… |
| … | …0010101010000000 |
| 3 | 10010212212200101022 |
| 4 | 1020212102222000 |
| 5 | 4443301404230 |
| 6 | 320505525012 |
| 7 | 42116543642 |
| oct | 11046225200 |
| 9 | 3125780338 |
| 10 | 1217997440 |
| 11 | 575589560 |
| 12 | 29baa3768 |
| 13 | 16545625a |
| 14 | b7a96892 |
| 15 | 71de31e5 |
| hex | 48992a80 |
1217997440 has 128 divisors (see below), whose sum is σ = 3279536640. Its totient is φ = 428544000.
The previous prime is 1217997439. The next prime is 1217997449. The reversal of 1217997440 is 447997121.
It is a tau number, because it is divible by the number of its divisors (128).
It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.
It is a Harshad number since it is a multiple of its sum of digits (44).
It is a junction number, because it is equal to n+sod(n) for n = 1217997391 and 1217997400.
It is not an unprimeable number, because it can be changed into a prime (1217997449) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 215450 + ... + 221030.
It is an arithmetic number, because the mean of its divisors is an integer number (25621380).
Almost surely, 21217997440 is an apocalyptic number.
1217997440 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 1217997440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1639768320).
1217997440 is an abundant number, since it is smaller than the sum of its proper divisors (2061539200).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1217997440 is a wasteful number, since it uses less digits than its factorization.
1217997440 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 5642 (or 5630 counting only the distinct ones).
The product of its (nonzero) digits is 127008, while the sum is 44.
The square root of 1217997440 is about 34899.8200568427. The cubic root of 1217997440 is about 1067.9447665563.
The spelling of 1217997440 in words is "one billion, two hundred seventeen million, nine hundred ninety-seven thousand, four hundred forty".
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