31996039 has 4 divisors (see below), whose sum is σ = 32007456. Its totient is φ = 31984624.

The previous prime is 31996037. The next prime is 31996043. The reversal of 31996039 is 93069913.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 31996039 - 2¹ = 31996037 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31995992 and 31996010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31996033) 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, 1707 + ... + 8179.

It is an arithmetic number, because the mean of its divisors is an integer number (8001864).

Almost surely, 2^31996039 is an apocalyptic number.

31996039 is a deficient number, since it is larger than the sum of its proper divisors (11417).

31996039 is an equidigital number, since it uses as much as digits as its factorization.

31996039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11416.

The product of its (nonzero) digits is 39366, while the sum is 40.

The square root of 31996039 is about 5656.5041324125. The cubic root of 31996039 is about 317.4671104874.

The spelling of 31996039 in words is "thirty-one million, nine hundred ninety-six thousand, thirty-nine".