831393872 has 10 divisors (see below), whose sum is σ = 1610825658. Its totient is φ = 415696928.

The previous prime is 831393869. The next prime is 831393877. The reversal of 831393872 is 278393138.

It can be written as a sum of positive squares in only one way, i.e., 591267856 + 240126016 = 24316^2 + 15496^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (831393877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25981043 + ... + 25981074.

Almost surely, 2^831393872 is an apocalyptic number.

It is an amenable number.

831393872 is a deficient number, since it is larger than the sum of its proper divisors (779431786).

831393872 is a wasteful number, since it uses less digits than its factorization.

831393872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51962125 (or 51962119 counting only the distinct ones).

The product of its digits is 217728, while the sum is 44.

The square root of 831393872 is about 28833.9014356365. The cubic root of 831393872 is about 940.3054205964.

The spelling of 831393872 in words is "eight hundred thirty-one million, three hundred ninety-three thousand, eight hundred seventy-two".