31729172 has 12 divisors (see below), whose sum is σ = 55964160. Its totient is φ = 15739416.

The previous prime is 31729171. The next prime is 31729193. The reversal of 31729172 is 27192713.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31729171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30722 + ... + 31737.

It is an arithmetic number, because the mean of its divisors is an integer number (4663680).

Almost surely, 2^31729172 is an apocalyptic number.

It is an amenable number.

31729172 is a deficient number, since it is larger than the sum of its proper divisors (24234988).

31729172 is a wasteful number, since it uses less digits than its factorization.

31729172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62590 (or 62588 counting only the distinct ones).

The product of its digits is 5292, while the sum is 32.

The square root of 31729172 is about 5632.8653454525. The cubic root of 31729172 is about 316.5820203428.

The spelling of 31729172 in words is "thirty-one million, seven hundred twenty-nine thousand, one hundred seventy-two".