31387412 has 24 divisors (see below), whose sum is σ = 63114240. Its totient is φ = 13379040.

The previous prime is 31387409. The next prime is 31387417. The reversal of 31387412 is 21478313.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31387417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2414 + ... + 8282.

It is an arithmetic number, because the mean of its divisors is an integer number (2629760).

Almost surely, 2^31387412 is an apocalyptic number.

It is an amenable number.

31387412 is an abundant number, since it is smaller than the sum of its proper divisors (31726828).

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

31387412 is a wasteful number, since it uses less digits than its factorization.

31387412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6071 (or 6069 counting only the distinct ones).

The product of its digits is 4032, while the sum is 29.

The square root of 31387412 is about 5602.4469653893. The cubic root of 31387412 is about 315.4412628216.

Subtracting from 31387412 its reverse (21478313), we obtain a palindrome (9909099).

The spelling of 31387412 in words is "thirty-one million, three hundred eighty-seven thousand, four hundred twelve".