39891923 has 2 divisors, whose sum is σ = 39891924. Its totient is φ = 39891922.

The previous prime is 39891899. The next prime is 39891941. The reversal of 39891923 is 32919893.

39891923 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39891923 - 2¹⁶ = 39826387 is a prime.

It is not a weakly prime, because it can be changed into another prime (39891953) 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 as a sum of consecutive naturals, namely, 19945961 + 19945962.

It is an arithmetic number, because the mean of its divisors is an integer number (19945962).

Almost surely, 2^39891923 is an apocalyptic number.

39891923 is a deficient number, since it is larger than the sum of its proper divisors (1).

39891923 is an equidigital number, since it uses as much as digits as its factorization.

39891923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 44.

The square root of 39891923 is about 6316.0053039876. The cubic root of 39891923 is about 341.6868963896.

The spelling of 39891923 in words is "thirty-nine million, eight hundred ninety-one thousand, nine hundred twenty-three".