931381388 has 24 divisors (see below), whose sum is σ = 1863413664. Its totient is φ = 399024000.

The previous prime is 931381331. The next prime is 931381441. The reversal of 931381388 is 883183139.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139568 + ... + 146088.

It is an arithmetic number, because the mean of its divisors is an integer number (77642236).

Almost surely, 2^931381388 is an apocalyptic number.

It is an amenable number.

931381388 is an abundant number, since it is smaller than the sum of its proper divisors (932032276).

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

931381388 is a wasteful number, since it uses less digits than its factorization.

931381388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11633 (or 11631 counting only the distinct ones).

The product of its digits is 124416, while the sum is 44.

The square root of 931381388 is about 30518.5417082796. The cubic root of 931381388 is about 976.5830563351.

The spelling of 931381388 in words is "nine hundred thirty-one million, three hundred eighty-one thousand, three hundred eighty-eight".