31729372 has 12 divisors (see below), whose sum is σ = 55739376. Its totient is φ = 15803840.

The previous prime is 31729349. The next prime is 31729409. The reversal of 31729372 is 27392713.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14029 + ... + 16132.

It is an arithmetic number, because the mean of its divisors is an integer number (4644948).

Almost surely, 2^31729372 is an apocalyptic number.

It is an amenable number.

31729372 is a deficient number, since it is larger than the sum of its proper divisors (24010004).

31729372 is a wasteful number, since it uses less digits than its factorization.

31729372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30428 (or 30426 counting only the distinct ones).

The product of its digits is 15876, while the sum is 34.

The square root of 31729372 is about 5632.8830983787. The cubic root of 31729372 is about 316.5826855169.

It can be divided in two parts, 3172 and 9372, that added together give a square (12544 = 112²).

The spelling of 31729372 in words is "thirty-one million, seven hundred twenty-nine thousand, three hundred seventy-two".