15979940 has 24 divisors (see below), whose sum is σ = 35017920. Its totient is φ = 6113888.

The previous prime is 15979921. The next prime is 15979979. The reversal of 15979940 is 4997951.

It is a junction number, because it is equal to n+sod(n) for n = 15979891 and 15979900.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16910 + ... + 17829.

It is an arithmetic number, because the mean of its divisors is an integer number (1459080).

Almost surely, 2^15979940 is an apocalyptic number.

15979940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15979940 is an abundant number, since it is smaller than the sum of its proper divisors (19037980).

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

15979940 is a wasteful number, since it uses less digits than its factorization.

15979940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34771 (or 34769 counting only the distinct ones).

The product of its (nonzero) digits is 102060, while the sum is 44.

The square root of 15979940 is about 3997.4917135624. The cubic root of 15979940 is about 251.8788575371.

The spelling of 15979940 in words is "fifteen million, nine hundred seventy-nine thousand, nine hundred forty".