39992021 has 8 divisors (see below), whose sum is σ = 41025600. Its totient is φ = 38984316.

The previous prime is 39992011. The next prime is 39992023. The reversal of 39992021 is 12029993.

39992021 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 39992021 - 2²² = 35797717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39992023) 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 7 ways as a sum of consecutive naturals, for example, 79256 + ... + 79758.

It is an arithmetic number, because the mean of its divisors is an integer number (5128200).

Almost surely, 2^39992021 is an apocalyptic number.

It is an amenable number.

39992021 is a deficient number, since it is larger than the sum of its proper divisors (1033579).

39992021 is an frugal number, since it uses more digits than its factorization.

39992021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632 (or 546 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 39992021 is about 6323.9244935404. The cubic root of 39992021 is about 341.9724479930.

The spelling of 39992021 in words is "thirty-nine million, nine hundred ninety-two thousand, twenty-one".