13109978 has 16 divisors (see below), whose sum is σ = 22576320. Its totient is φ = 5593056.

The previous prime is 13109963. The next prime is 13109983. The reversal of 13109978 is 87990131.

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, 1253 + ... + 5271.

It is an arithmetic number, because the mean of its divisors is an integer number (1411020).

Almost surely, 2^13109978 is an apocalyptic number.

13109978 is a deficient number, since it is larger than the sum of its proper divisors (9466342).

13109978 is a wasteful number, since it uses less digits than its factorization.

13109978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4261.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 13109978 is about 3620.7703600201. The cubic root of 13109978 is about 235.7946720272.

The spelling of 13109978 in words is "thirteen million, one hundred nine thousand, nine hundred seventy-eight".