831390138 has 24 divisors (see below), whose sum is σ = 1826024148. Its totient is φ = 273333312.

The previous prime is 831390127. The next prime is 831390143. The reversal of 831390138 is 831093138.

It can be written as a sum of positive squares in 2 ways, for example, as 824436369 + 6953769 = 28713^2 + 2637^2 .

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 11 ways as a sum of consecutive naturals, for example, 315045 + ... + 317672.

Almost surely, 2^831390138 is an apocalyptic number.

831390138 is an abundant number, since it is smaller than the sum of its proper divisors (994634010).

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

831390138 is a wasteful number, since it uses less digits than its factorization.

831390138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632798 (or 632795 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 831390138 is about 28833.8366853945. The cubic root of 831390138 is about 940.3040128779.

The spelling of 831390138 in words is "eight hundred thirty-one million, three hundred ninety thousand, one hundred thirty-eight".