31320039 has 16 divisors (see below), whose sum is σ = 43188992. Its totient is φ = 20176128.

The previous prime is 31320011. The next prime is 31320041. The reversal of 31320039 is 93002313.

It is not a de Polignac number, because 31320039 - 2⁵ = 31320007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31319997 and 31320024.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320049) 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 15 ways as a sum of consecutive naturals, for example, 11262 + ... + 13764.

It is an arithmetic number, because the mean of its divisors is an integer number (2699312).

Almost surely, 2^31320039 is an apocalyptic number.

31320039 is a deficient number, since it is larger than the sum of its proper divisors (11868953).

31320039 is a wasteful number, since it uses less digits than its factorization.

31320039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2646.

The product of its (nonzero) digits is 486, while the sum is 21.

The square root of 31320039 is about 5596.4309162179. The cubic root of 31320039 is about 315.2154031860.

The spelling of 31320039 in words is "thirty-one million, three hundred twenty thousand, thirty-nine".