39641939 has 2 divisors, whose sum is σ = 39641940. Its totient is φ = 39641938.

The previous prime is 39641929. The next prime is 39641947. The reversal of 39641939 is 93914693.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39641939 - 2⁸ = 39641683 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39641939.

It is not a weakly prime, because it can be changed into another prime (39641929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19820969 + 19820970.

It is an arithmetic number, because the mean of its divisors is an integer number (19820970).

Almost surely, 2^39641939 is an apocalyptic number.

39641939 is a deficient number, since it is larger than the sum of its proper divisors (1).

39641939 is an equidigital number, since it uses as much as digits as its factorization.

39641939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 157464, while the sum is 44.

The square root of 39641939 is about 6296.1844795082. The cubic root of 39641939 is about 340.9716697166.

The spelling of 39641939 in words is "thirty-nine million, six hundred forty-one thousand, nine hundred thirty-nine".