31254990 has 32 divisors (see below), whose sum is σ = 80783136. Its totient is φ = 7693440.

The previous prime is 31254989. The next prime is 31254991. The reversal of 31254990 is 9945213.

It is an interprime number because it is at equal distance from previous prime (31254989) and next prime (31254991).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31254991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39681 + ... + 40460.

It is an arithmetic number, because the mean of its divisors is an integer number (2524473).

Almost surely, 2^31254990 is an apocalyptic number.

31254990 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31254990 is an abundant number, since it is smaller than the sum of its proper divisors (49528146).

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

31254990 is a wasteful number, since it uses less digits than its factorization.

31254990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80164.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 31254990 is about 5590.6162451021. The cubic root of 31254990 is about 314.9970269309.

The spelling of 31254990 in words is "thirty-one million, two hundred fifty-four thousand, nine hundred ninety".