39939723 has 14 divisors (see below), whose sum is σ = 59883284. Its totient is φ = 26625996.

The previous prime is 39939719. The next prime is 39939763. The reversal of 39939723 is 32793993.

39939723 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 39939723 - 2² = 39939719 is a prime.

It is a super-3 number, since 3×39939723³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39939763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 26665 + ... + 28122.

Almost surely, 2^39939723 is an apocalyptic number.

39939723 is a deficient number, since it is larger than the sum of its proper divisors (19943561).

39939723 is an frugal number, since it uses more digits than its factorization.

39939723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54805 (or 54790 counting only the distinct ones).

The product of its digits is 275562, while the sum is 45.

The square root of 39939723 is about 6319.7882084766. The cubic root of 39939723 is about 341.8233159394.

The spelling of 39939723 in words is "thirty-nine million, nine hundred thirty-nine thousand, seven hundred twenty-three".