12978931 has 8 divisors (see below), whose sum is σ = 14882400. Its totient is φ = 11087808.

The previous prime is 12978929. The next prime is 12978937. The reversal of 12978931 is 13987921.

12978931 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12978931 - 2¹ = 12978929 is a prime.

It is a super-2 number, since 2×12978931² = 336905299805522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12978937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 706 + ... + 5143.

It is an arithmetic number, because the mean of its divisors is an integer number (1860300).

Almost surely, 2^12978931 is an apocalyptic number.

12978931 is a deficient number, since it is larger than the sum of its proper divisors (1903469).

12978931 is an equidigital number, since it uses as much as digits as its factorization.

12978931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6173.

The product of its digits is 27216, while the sum is 40.

The square root of 12978931 is about 3602.6283460829. The cubic root of 12978931 is about 235.0063737520.

The spelling of 12978931 in words is "twelve million, nine hundred seventy-eight thousand, nine hundred thirty-one".