15913980 has 36 divisors (see below), whose sum is σ = 48272952. Its totient is φ = 4243680.

The previous prime is 15913973. The next prime is 15913981. The reversal of 15913980 is 8931951.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15913981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44026 + ... + 44385.

Almost surely, 2^15913980 is an apocalyptic number.

15913980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15913980 is an abundant number, since it is smaller than the sum of its proper divisors (32358972).

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

15913980 is a wasteful number, since it uses less digits than its factorization.

15913980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88426 (or 88421 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 15913980 is about 3989.2330089881. The cubic root of 15913980 is about 251.5318215871.

The spelling of 15913980 in words is "fifteen million, nine hundred thirteen thousand, nine hundred eighty".