31140939 has 8 divisors (see below), whose sum is σ = 42643600. Its totient is φ = 20199456.

The previous prime is 31140929. The next prime is 31140979. The reversal of 31140939 is 93904113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31140939 - 2¹⁵ = 31108171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31140929) 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, 140164 + ... + 140385.

It is an arithmetic number, because the mean of its divisors is an integer number (5330450).

Almost surely, 2^31140939 is an apocalyptic number.

31140939 is a deficient number, since it is larger than the sum of its proper divisors (11502661).

31140939 is a wasteful number, since it uses less digits than its factorization.

31140939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280589.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 31140939 is about 5580.4067056085. The cubic root of 31140939 is about 314.6134133813.

The spelling of 31140939 in words is "thirty-one million, one hundred forty thousand, nine hundred thirty-nine".