31307490 has 48 divisors (see below), whose sum is σ = 81926208. Its totient is φ = 8294688.

The previous prime is 31307461. The next prime is 31307503. The reversal of 31307490 is 9470313.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13989 + ... + 16071.

It is an arithmetic number, because the mean of its divisors is an integer number (1706796).

Almost surely, 2^31307490 is an apocalyptic number.

31307490 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31307490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40963104).

31307490 is an abundant number, since it is smaller than the sum of its proper divisors (50618718).

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

31307490 is a wasteful number, since it uses less digits than its factorization.

31307490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2263 (or 2260 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 31307490 is about 5595.3096429063. The cubic root of 31307490 is about 315.1732984437.

The spelling of 31307490 in words is "thirty-one million, three hundred seven thousand, four hundred ninety".