31693404 has 48 divisors (see below), whose sum is σ = 77807520. Its totient is φ = 10026240.

The previous prime is 31693393. The next prime is 31693411. The reversal of 31693404 is 40439613.

It is a congruent number.

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, 20482 + ... + 21974.

It is an arithmetic number, because the mean of its divisors is an integer number (1620990).

Almost surely, 2^31693404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31693404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38903760).

31693404 is an abundant number, since it is smaller than the sum of its proper divisors (46114116).

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

31693404 is a wasteful number, since it uses less digits than its factorization.

31693404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1590 (or 1588 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 31693404 is about 5629.6895118648. The cubic root of 31693404 is about 316.4630156265.

The spelling of 31693404 in words is "thirty-one million, six hundred ninety-three thousand, four hundred four".