31138832 has 40 divisors (see below), whose sum is σ = 64281600. Its totient is φ = 14561792.

The previous prime is 31138829. The next prime is 31138841. The reversal of 31138832 is 23883113.

It is a junction number, because it is equal to n+sod(n) for n = 31138795 and 31138804.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64769 + ... + 65247.

It is an arithmetic number, because the mean of its divisors is an integer number (1607040).

Almost surely, 2^31138832 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31138832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32140800).

31138832 is an abundant number, since it is smaller than the sum of its proper divisors (33142768).

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

31138832 is a wasteful number, since it uses less digits than its factorization.

31138832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743 (or 737 counting only the distinct ones).

The product of its digits is 3456, while the sum is 29.

The square root of 31138832 is about 5580.2179168918. The cubic root of 31138832 is about 314.6063176263.

The spelling of 31138832 in words is "thirty-one million, one hundred thirty-eight thousand, eight hundred thirty-two".