31117392 has 40 divisors (see below), whose sum is σ = 89319680. Its totient is φ = 10372320.

The previous prime is 31117391. The next prime is 31117399. The reversal of 31117392 is 29371113.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31117391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35584 + ... + 36447.

It is an arithmetic number, because the mean of its divisors is an integer number (2232992).

Almost surely, 2^31117392 is an apocalyptic number.

It is an amenable number.

31117392 is an abundant number, since it is smaller than the sum of its proper divisors (58202288).

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

31117392 is a wasteful number, since it uses less digits than its factorization.

31117392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72048 (or 72036 counting only the distinct ones).

The product of its digits is 1134, while the sum is 27.

The square root of 31117392 is about 5578.2965141699. The cubic root of 31117392 is about 314.5340958196.

The spelling of 31117392 in words is "thirty-one million, one hundred seventeen thousand, three hundred ninety-two".