| Base | Representation |
|---|---|
| bin | 100110000110… |
| … | …1000011111000 |
| 3 | 1101120220112011 |
| 4 | 1030031003320 |
| 5 | 20103221230 |
| 6 | 1552055304 |
| 7 | 331540231 |
| oct | 114150370 |
| 9 | 41526464 |
| 10 | 19976440 |
| 11 | 10304660 |
| 12 | 6834534 |
| 13 | 41a57a3 |
| 14 | 2920088 |
| 15 | 1b48e2a |
| hex | 130d0f8 |
19976440 has 64 divisors (see below), whose sum is σ = 49714560. Its totient is φ = 7163520.
The previous prime is 19976423. The next prime is 19976441. The reversal of 19976440 is 4467991.
It is a happy number.
It is a Smith number, since the sum of its digits (40) 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 (40).
It is a junction number, because it is equal to n+sod(n) for n = 19976393 and 19976402.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (19976441) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36247 + ... + 36793.
It is an arithmetic number, because the mean of its divisors is an integer number (776790).
Almost surely, 219976440 is an apocalyptic number.
19976440 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 19976440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24857280).
19976440 is an abundant number, since it is smaller than the sum of its proper divisors (29738120).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
19976440 is a wasteful number, since it uses less digits than its factorization.
19976440 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 652 (or 648 counting only the distinct ones).
The product of its (nonzero) digits is 54432, while the sum is 40.
The square root of 19976440 is about 4469.5010907259. The cubic root of 19976440 is about 271.3351336475.
The spelling of 19976440 in words is "nineteen million, nine hundred seventy-six thousand, four hundred forty".
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