15963980 has 12 divisors (see below), whose sum is σ = 33524400. Its totient is φ = 6385584.

The previous prime is 15963967. The next prime is 15963991. The reversal of 15963980 is 8936951.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399080 + ... + 399119.

It is an arithmetic number, because the mean of its divisors is an integer number (2793700).

Almost surely, 2^15963980 is an apocalyptic number.

15963980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15963980 is an abundant number, since it is smaller than the sum of its proper divisors (17560420).

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

15963980 is a wasteful number, since it uses less digits than its factorization.

15963980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798208 (or 798206 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 15963980 is about 3995.4949630803. The cubic root of 15963980 is about 251.7949747517.

The spelling of 15963980 in words is "fifteen million, nine hundred sixty-three thousand, nine hundred eighty".