13279978 has 4 divisors (see below), whose sum is σ = 19919970. Its totient is φ = 6639988.

The previous prime is 13279969. The next prime is 13280017. The reversal of 13279978 is 87997231.

It is a happy number.

13279978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 9566649 + 3713329 = 3093^2 + 1927^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3319993 + ... + 3319996.

Almost surely, 2^13279978 is an apocalyptic number.

13279978 is a deficient number, since it is larger than the sum of its proper divisors (6639992).

13279978 is an equidigital number, since it uses as much as digits as its factorization.

13279978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6639991.

The product of its digits is 190512, while the sum is 46.

The square root of 13279978 is about 3644.1704131393. The cubic root of 13279978 is about 236.8094987401.

The spelling of 13279978 in words is "thirteen million, two hundred seventy-nine thousand, nine hundred seventy-eight".