39991023 has 16 divisors (see below), whose sum is σ = 61158400. Its totient is φ = 25800120.

The previous prime is 39991019. The next prime is 39991033. The reversal of 39991023 is 32019993.

It is not a de Polignac number, because 39991023 - 2² = 39991019 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 (39991033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23053 + ... + 24726.

It is an arithmetic number, because the mean of its divisors is an integer number (3822400).

Almost surely, 2^39991023 is an apocalyptic number.

39991023 is a deficient number, since it is larger than the sum of its proper divisors (21167377).

39991023 is a wasteful number, since it uses less digits than its factorization.

39991023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47819 (or 47813 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 36.

The square root of 39991023 is about 6323.8455863501. The cubic root of 39991023 is about 341.9696033311.

The spelling of 39991023 in words is "thirty-nine million, nine hundred ninety-one thousand, twenty-three".