31384872 has 48 divisors (see below), whose sum is σ = 85312500. Its totient is φ = 10423296.

The previous prime is 31384853. The next prime is 31384879. The reversal of 31384872 is 27848313.

It can be written as a sum of positive squares in 2 ways, for example, as 31203396 + 181476 = 5586^2 + 426^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (31384879) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24504 + ... + 25752.

Almost surely, 2^31384872 is an apocalyptic number.

It is an amenable number.

31384872 is an abundant number, since it is smaller than the sum of its proper divisors (53927628).

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

31384872 is a wasteful number, since it uses less digits than its factorization.

31384872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1610 (or 1603 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 31384872 is about 5602.2202741413. The cubic root of 31384872 is about 315.4327536521.

The spelling of 31384872 in words is "thirty-one million, three hundred eighty-four thousand, eight hundred seventy-two".