15868980 has 48 divisors (see below), whose sum is σ = 49371840. Its totient is φ = 4231584.

The previous prime is 15868961. The next prime is 15868981. The reversal of 15868980 is 8986851.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15868981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14154 + ... + 15233.

It is an arithmetic number, because the mean of its divisors is an integer number (1028580).

Almost surely, 2^15868980 is an apocalyptic number.

15868980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15868980 is an abundant number, since it is smaller than the sum of its proper divisors (33502860).

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

15868980 is a wasteful number, since it uses less digits than its factorization.

15868980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29405 (or 29397 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 15868980 is about 3983.5888342047. The cubic root of 15868980 is about 251.2945120513.

The spelling of 15868980 in words is "fifteen million, eight hundred sixty-eight thousand, nine hundred eighty".