31939 has 6 divisors (see below), whose sum is σ = 34460. Its totient is φ = 29520.

The previous prime is 31907. The next prime is 31957. The reversal of 31939 is 93913.

It is not a de Polignac number, because 31939 - 2⁵ = 31907 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (31039) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 759 + ... + 799.

2³¹⁹³⁹ is an apocalyptic number.

31939 is a deficient number, since it is larger than the sum of its proper divisors (2521).

31939 is an equidigital number, since it uses as much as digits as its factorization.

31939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101 (or 60 counting only the distinct ones).

The product of its digits is 729, while the sum is 25.

The square root of 31939 is about 178.7148566852. The cubic root of 31939 is about 31.7278349857.

The spelling of 31939 in words is "thirty-one thousand, nine hundred thirty-nine".