31400404 has 12 divisors (see below), whose sum is σ = 62800864. Its totient is φ = 13457304.

The previous prime is 31400401. The next prime is 31400429. The reversal of 31400404 is 40400413.

31400404 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31400401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 560694 + ... + 560749.

Almost surely, 2^31400404 is an apocalyptic number.

It is an amenable number.

31400404 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

31400404 is a wasteful number, since it uses less digits than its factorization.

31400404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121454 (or 1121452 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 31400404 is about 5603.6063387786. The cubic root of 31400404 is about 315.4847797105.

Adding to 31400404 its reverse (40400413), we get a palindrome (71800817).

Subtracting 31400404 from its reverse (40400413), we obtain a palindrome (9000009).

The spelling of 31400404 in words is "thirty-one million, four hundred thousand, four hundred four".