31189690 has 16 divisors (see below), whose sum is σ = 64161792. Its totient is φ = 10693584.

The previous prime is 31189681. The next prime is 31189721. The reversal of 31189690 is 9698113.

It is a super-2 number, since 2×31189690² = 1945593524592200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 222714 + ... + 222853.

It is an arithmetic number, because the mean of its divisors is an integer number (4010112).

Almost surely, 2^31189690 is an apocalyptic number.

31189690 is an abundant number, since it is smaller than the sum of its proper divisors (32972102).

31189690 is a wasteful number, since it uses less digits than its factorization.

31189690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445581.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 31189690 is about 5584.7730482089. The cubic root of 31189690 is about 314.7775030785. Note that the first 3 decimals are identical.

The spelling of 31189690 in words is "thirty-one million, one hundred eighty-nine thousand, six hundred ninety".