31405012 has 6 divisors (see below), whose sum is σ = 54958778. Its totient is φ = 15702504.

The previous prime is 31404983. The next prime is 31405021. The reversal of 31405012 is 21050413.

It can be written as a sum of positive squares in only one way, i.e., 31404816 + 196 = 5604^2 + 14^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3925623 + ... + 3925630.

Almost surely, 2^31405012 is an apocalyptic number.

It is an amenable number.

31405012 is a deficient number, since it is larger than the sum of its proper divisors (23553766).

31405012 is a wasteful number, since it uses less digits than its factorization.

31405012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7851257 (or 7851255 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 31405012 is about 5604.0174874816. The cubic root of 31405012 is about 315.5002113884.

Adding to 31405012 its reverse (21050413), we get a palindrome (52455425).

The spelling of 31405012 in words is "thirty-one million, four hundred five thousand, twelve".