31930418 has 16 divisors (see below), whose sum is σ = 51679320. Its totient is φ = 14708736.

The previous prime is 31930411. The next prime is 31930439. The reversal of 31930418 is 81403913.

It can be written as a sum of positive squares in 4 ways, for example, as 15389929 + 16540489 = 3923^2 + 4067^2 .

It is not an unprimeable number, because it can be changed into a prime (31930411) 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 7 ways as a sum of consecutive naturals, for example, 19196 + ... + 20792.

Almost surely, 2^31930418 is an apocalyptic number.

31930418 is a deficient number, since it is larger than the sum of its proper divisors (19748902).

31930418 is a wasteful number, since it uses less digits than its factorization.

31930418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2381.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 31930418 is about 5650.7006645194. The cubic root of 31930418 is about 317.2499297776.

The spelling of 31930418 in words is "thirty-one million, nine hundred thirty thousand, four hundred eighteen".