13307978 has 4 divisors (see below), whose sum is σ = 19961970. Its totient is φ = 6653988.

The previous prime is 13307951. The next prime is 13307989. The reversal of 13307978 is 87970331.

It is a happy number.

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., 11992369 + 1315609 = 3463^2 + 1147^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3326993 + ... + 3326996.

Almost surely, 2^13307978 is an apocalyptic number.

13307978 is a deficient number, since it is larger than the sum of its proper divisors (6653992).

13307978 is an equidigital number, since it uses as much as digits as its factorization.

13307978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6653991.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 13307978 is about 3648.0101425298. The cubic root of 13307978 is about 236.9758145604.

The spelling of 13307978 in words is "thirteen million, three hundred seven thousand, nine hundred seventy-eight".