31914239 has 24 divisors (see below), whose sum is σ = 39507840. Its totient is φ = 25655616.

The previous prime is 31914229. The next prime is 31914263. The reversal of 31914239 is 93241913.

It is not a de Polignac number, because 31914239 - 2¹² = 31910143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31914209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52274 + ... + 52880.

It is an arithmetic number, because the mean of its divisors is an integer number (1646160).

Almost surely, 2^31914239 is an apocalyptic number.

31914239 is a deficient number, since it is larger than the sum of its proper divisors (7593601).

31914239 is a wasteful number, since it uses less digits than its factorization.

31914239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687 (or 680 counting only the distinct ones).

The product of its digits is 5832, while the sum is 32.

The square root of 31914239 is about 5649.2688907504. The cubic root of 31914239 is about 317.1963376848.

The spelling of 31914239 in words is "thirty-one million, nine hundred fourteen thousand, two hundred thirty-nine".