31090404 has 24 divisors (see below), whose sum is σ = 73775520. Its totient is φ = 10187584.

The previous prime is 31090393. The next prime is 31090417. The reversal of 31090404 is 40409013.

It is a super-4 number, since 4×31090404⁴ (a number of 31 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21249 + ... + 22664.

It is an arithmetic number, because the mean of its divisors is an integer number (3073980).

Almost surely, 2^31090404 is an apocalyptic number.

It is an amenable number.

31090404 is an abundant number, since it is smaller than the sum of its proper divisors (42685116).

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

31090404 is a wasteful number, since it uses less digits than its factorization.

31090404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43979 (or 43977 counting only the distinct ones).

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

The square root of 31090404 is about 5575.8769713831. The cubic root of 31090404 is about 314.4431380960.

Adding to 31090404 its reverse (40409013), we get a palindrome (71499417).

The spelling of 31090404 in words is "thirty-one million, ninety thousand, four hundred four".