31138996 has 12 divisors (see below), whose sum is σ = 62278048. Its totient is φ = 13345272.

The previous prime is 31138993. The next prime is 31138997. The reversal of 31138996 is 69983113.

31138996 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31138993) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 556026 + ... + 556081.

Almost surely, 2^31138996 is an apocalyptic number.

It is an amenable number.

31138996 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

31138996 is a wasteful number, since it uses less digits than its factorization.

31138996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112118 (or 1112116 counting only the distinct ones).

The product of its digits is 34992, while the sum is 40.

The square root of 31138996 is about 5580.2326116391. The cubic root of 31138996 is about 314.6068699415.

The spelling of 31138996 in words is "thirty-one million, one hundred thirty-eight thousand, nine hundred ninety-six".