31391472 has 40 divisors (see below), whose sum is σ = 92680576. Its totient is φ = 8968896.

The previous prime is 31391471. The next prime is 31391489. The reversal of 31391472 is 27419313.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31391471) 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, 46378 + ... + 47049.

Almost surely, 2^31391472 is an apocalyptic number.

It is an amenable number.

31391472 is an abundant number, since it is smaller than the sum of its proper divisors (61289104).

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

31391472 is a wasteful number, since it uses less digits than its factorization.

31391472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93445 (or 93439 counting only the distinct ones).

The product of its digits is 4536, while the sum is 30.

The square root of 31391472 is about 5602.8092953446. The cubic root of 31391472 is about 315.4548631391.

The spelling of 31391472 in words is "thirty-one million, three hundred ninety-one thousand, four hundred seventy-two".