31042290 has 32 divisors (see below), whose sum is σ = 75727296. Its totient is φ = 8141760.

The previous prime is 31042283. The next prime is 31042303. The reversal of 31042290 is 9224013.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6652 + ... + 10311.

It is an arithmetic number, because the mean of its divisors is an integer number (2366478).

Almost surely, 2^31042290 is an apocalyptic number.

31042290 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31042290 is an abundant number, since it is smaller than the sum of its proper divisors (44685006).

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

31042290 is a wasteful number, since it uses less digits than its factorization.

31042290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17034.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 31042290 is about 5571.5608226062. The cubic root of 31042290 is about 314.2808487047.

The spelling of 31042290 in words is "thirty-one million, forty-two thousand, two hundred ninety".