15799640 has 32 divisors (see below), whose sum is σ = 37422000. Its totient is φ = 5986944.

The previous prime is 15799639. The next prime is 15799657. The reversal of 15799640 is 4699751.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 9635 + ... + 11154.

Almost surely, 2^15799640 is an apocalyptic number.

15799640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15799640 is an abundant number, since it is smaller than the sum of its proper divisors (21622360).

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

15799640 is a wasteful number, since it uses less digits than its factorization.

15799640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20819 (or 20815 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 15799640 is about 3974.8760986979. The cubic root of 15799640 is about 250.9279645984.

The spelling of 15799640 in words is "fifteen million, seven hundred ninety-nine thousand, six hundred forty".