31402290 has 32 divisors (see below), whose sum is σ = 75551616. Its totient is φ = 8353280.

The previous prime is 31402289. The next prime is 31402309. The reversal of 31402290 is 9220413.

It is a super-2 number, since 2×31402290² = 1972207634488200, which contains 22 as substring.

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, 14050 + ... + 16130.

It is an arithmetic number, because the mean of its divisors is an integer number (2360988).

Almost surely, 2^31402290 is an apocalyptic number.

31402290 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31402290 is an abundant number, since it is smaller than the sum of its proper divisors (44149326).

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

31402290 is a wasteful number, since it uses less digits than its factorization.

31402290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2594.

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

The square root of 31402290 is about 5603.7746207356. The cubic root of 31402290 is about 315.4910958966.

The spelling of 31402290 in words is "thirty-one million, four hundred two thousand, two hundred ninety".