13118978 has 4 divisors (see below), whose sum is σ = 19678470. Its totient is φ = 6559488.

The previous prime is 13118957. The next prime is 13118981. The reversal of 13118978 is 87981131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 10452289 + 2666689 = 3233^2 + 1633^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3279743 + ... + 3279746.

Almost surely, 2^13118978 is an apocalyptic number.

13118978 is a deficient number, since it is larger than the sum of its proper divisors (6559492).

13118978 is an equidigital number, since it uses as much as digits as its factorization.

13118978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6559491.

The product of its digits is 12096, while the sum is 38.

The square root of 13118978 is about 3622.0129762330. The cubic root of 13118978 is about 235.8486173660.

The spelling of 13118978 in words is "thirteen million, one hundred eighteen thousand, nine hundred seventy-eight".