31690338 has 16 divisors (see below), whose sum is σ = 63714816. Its totient is φ = 10507760.

The previous prime is 31690331. The next prime is 31690349. The reversal of 31690338 is 83309613.

It is a junction number, because it is equal to n+sod(n) for n = 31690299 and 31690308.

It is not an unprimeable number, because it can be changed into a prime (31690331) 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, 12681 + ... + 14972.

It is an arithmetic number, because the mean of its divisors is an integer number (3982176).

Almost surely, 2^31690338 is an apocalyptic number.

31690338 is an abundant number, since it is smaller than the sum of its proper divisors (32024478).

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

31690338 is a wasteful number, since it uses less digits than its factorization.

31690338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27849.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 31690338 is about 5629.4171989647. The cubic root of 31690338 is about 316.4528104863.

The spelling of 31690338 in words is "thirty-one million, six hundred ninety thousand, three hundred thirty-eight".