39504139 has 2 divisors, whose sum is σ = 39504140. Its totient is φ = 39504138.

The previous prime is 39504109. The next prime is 39504161. The reversal of 39504139 is 93140593.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39504139 - 2⁷ = 39504011 is a prime.

It is not a weakly prime, because it can be changed into another prime (39504109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19752069 + 19752070.

It is an arithmetic number, because the mean of its divisors is an integer number (19752070).

Almost surely, 2^39504139 is an apocalyptic number.

39504139 is a deficient number, since it is larger than the sum of its proper divisors (1).

39504139 is an equidigital number, since it uses as much as digits as its factorization.

39504139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 39504139 is about 6285.2318175227. The cubic root of 39504139 is about 340.5761252884.

The spelling of 39504139 in words is "thirty-nine million, five hundred four thousand, one hundred thirty-nine".