31421732 has 24 divisors (see below), whose sum is σ = 58429560. Its totient is φ = 14757120.

The previous prime is 31421713. The next prime is 31421737. The reversal of 31421732 is 23712413.

It can be written as a sum of positive squares in 4 ways, for example, as 1893376 + 29528356 = 1376^2 + 5434^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31421698 and 31421707.

It is not an unprimeable number, because it can be changed into a prime (31421737) 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, 632 + ... + 7952.

It is an arithmetic number, because the mean of its divisors is an integer number (2434565).

Almost surely, 2^31421732 is an apocalyptic number.

It is an amenable number.

31421732 is a deficient number, since it is larger than the sum of its proper divisors (27007828).

31421732 is a wasteful number, since it uses less digits than its factorization.

31421732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7391 (or 7389 counting only the distinct ones).

The product of its digits is 1008, while the sum is 23.

The square root of 31421732 is about 5605.5090759002. The cubic root of 31421732 is about 315.5561921306.

The spelling of 31421732 in words is "thirty-one million, four hundred twenty-one thousand, seven hundred thirty-two".