12939978 has 16 divisors (see below), whose sum is σ = 26267040. Its totient is φ = 4248816.

The previous prime is 12939967. The next prime is 12940001. The reversal of 12939978 is 87993921.

12939978 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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, 15693 + ... + 16496.

It is an arithmetic number, because the mean of its divisors is an integer number (1641690).

Almost surely, 2^12939978 is an apocalyptic number.

12939978 is an abundant number, since it is smaller than the sum of its proper divisors (13327062).

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

12939978 is a wasteful number, since it uses less digits than its factorization.

12939978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32261.

The product of its digits is 244944, while the sum is 48.

The square root of 12939978 is about 3597.2180918037. The cubic root of 12939978 is about 234.7710339645.

The spelling of 12939978 in words is "twelve million, nine hundred thirty-nine thousand, nine hundred seventy-eight".