39913409 has 2 divisors, whose sum is σ = 39913410. Its totient is φ = 39913408.

The previous prime is 39913373. The next prime is 39913421. The reversal of 39913409 is 90431993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31080625 + 8832784 = 5575^2 + 2972^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39913409 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (39913439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19956704 + 19956705.

It is an arithmetic number, because the mean of its divisors is an integer number (19956705).

Almost surely, 2^39913409 is an apocalyptic number.

It is an amenable number.

39913409 is a deficient number, since it is larger than the sum of its proper divisors (1).

39913409 is an equidigital number, since it uses as much as digits as its factorization.

39913409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 38.

The square root of 39913409 is about 6317.7059918929. The cubic root of 39913409 is about 341.7482301672.

The spelling of 39913409 in words is "thirty-nine million, nine hundred thirteen thousand, four hundred nine".