12931389 has 12 divisors (see below), whose sum is σ = 19183996. Its totient is φ = 8387712.

The previous prime is 12931379. The next prime is 12931393. The reversal of 12931389 is 98313921.

12931389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 7371225 + 5560164 = 2715^2 + 2358^2 .

It is not a de Polignac number, because 12931389 - 2⁸ = 12931133 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12931319) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19084 + ... + 19749.

Almost surely, 2^12931389 is an apocalyptic number.

It is an amenable number.

12931389 is a deficient number, since it is larger than the sum of its proper divisors (6252607).

12931389 is a wasteful number, since it uses less digits than its factorization.

12931389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38876 (or 38873 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 12931389 is about 3596.0240544246. The cubic root of 12931389 is about 234.7190788344.

The spelling of 12931389 in words is "twelve million, nine hundred thirty-one thousand, three hundred eighty-nine".