39409939 has 2 divisors, whose sum is σ = 39409940. Its totient is φ = 39409938.

The previous prime is 39409913. The next prime is 39409949. The reversal of 39409939 is 93990493.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39409939 - 2²¹ = 37312787 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (39409949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19704969 + 19704970.

It is an arithmetic number, because the mean of its divisors is an integer number (19704970).

Almost surely, 2^39409939 is an apocalyptic number.

39409939 is a deficient number, since it is larger than the sum of its proper divisors (1).

39409939 is an equidigital number, since it uses as much as digits as its factorization.

39409939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 236196, while the sum is 46.

The square root of 39409939 is about 6277.7335878484. The cubic root of 39409939 is about 340.3052017316.

The spelling of 39409939 in words is "thirty-nine million, four hundred nine thousand, nine hundred thirty-nine".