31216404 has 12 divisors (see below), whose sum is σ = 72838304. Its totient is φ = 10405464.

The previous prime is 31216397. The next prime is 31216447. The reversal of 31216404 is 40461213.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1300672 + ... + 1300695.

Almost surely, 2^31216404 is an apocalyptic number.

It is an amenable number.

31216404 is an abundant number, since it is smaller than the sum of its proper divisors (41621900).

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

31216404 is a wasteful number, since it uses less digits than its factorization.

31216404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2601374 (or 2601372 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 31216404 is about 5587.1642180985. The cubic root of 31216404 is about 314.8673465129.

Adding to 31216404 its reverse (40461213), we get a palindrome (71677617).

The spelling of 31216404 in words is "thirty-one million, two hundred sixteen thousand, four hundred four".