31899904 has 27 divisors (see below), whose sum is σ = 63856093. Its totient is φ = 15904768.

The previous prime is 31899893. The next prime is 31899911. The reversal of 31899904 is 40999813.

The square root of 31899904 is 5648.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 12960000 + 18939904 = 3600^2 + 4352^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 90192 + ... + 90544.

Almost surely, 2^31899904 is an apocalyptic number.

31899904 is the 5648-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31899904

31899904 is an abundant number, since it is smaller than the sum of its proper divisors (31956189).

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

31899904 is an frugal number, since it uses more digits than its factorization.

31899904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722 (or 355 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 43.

The cubic root of 31899904 is about 317.1488386101.

Subtracting 31899904 from its reverse (40999813), we obtain a palindrome (9099909).

The spelling of 31899904 in words is "thirty-one million, eight hundred ninety-nine thousand, nine hundred four".