31387086 has 12 divisors (see below), whose sum is σ = 68005392. Its totient is φ = 10462356.

The previous prime is 31387079. The next prime is 31387091. The reversal of 31387086 is 68078313.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 31387086.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 871846 + ... + 871881.

It is an arithmetic number, because the mean of its divisors is an integer number (5667116).

Almost surely, 2^31387086 is an apocalyptic number.

31387086 is an abundant number, since it is smaller than the sum of its proper divisors (36618306).

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

31387086 is a wasteful number, since it uses less digits than its factorization.

31387086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1743735 (or 1743732 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 31387086 is about 5602.4178708840. The cubic root of 31387086 is about 315.4401707255.

The spelling of 31387086 in words is "thirty-one million, three hundred eighty-seven thousand, eighty-six".