15790640 has 20 divisors (see below), whose sum is σ = 36713424. Its totient is φ = 6316224.

The previous prime is 15790631. The next prime is 15790657. The reversal of 15790640 is 4609751.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 15790597 and 15790606.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 98612 + ... + 98771.

Almost surely, 2^15790640 is an apocalyptic number.

15790640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15790640 is an abundant number, since it is smaller than the sum of its proper divisors (20922784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15790640 is a wasteful number, since it uses less digits than its factorization.

15790640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197396 (or 197390 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 15790640 is about 3973.7438266703. The cubic root of 15790640 is about 250.8803099128.

The spelling of 15790640 in words is "fifteen million, seven hundred ninety thousand, six hundred forty".