38913209 has 2 divisors, whose sum is σ = 38913210. Its totient is φ = 38913208.

The previous prime is 38913191. The next prime is 38913229. The reversal of 38913209 is 90231983.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21715600 + 17197609 = 4660^2 + 4147^2 .

It is a cyclic number.

It is not a de Polignac number, because 38913209 - 2⁸ = 38912953 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (38913229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19456604 + 19456605.

It is an arithmetic number, because the mean of its divisors is an integer number (19456605).

Almost surely, 2^38913209 is an apocalyptic number.

It is an amenable number.

38913209 is a deficient number, since it is larger than the sum of its proper divisors (1).

38913209 is an equidigital number, since it uses as much as digits as its factorization.

38913209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 38913209 is about 6238.0452867866. The cubic root of 38913209 is about 338.8693962372.

The spelling of 38913209 in words is "thirty-eight million, nine hundred thirteen thousand, two hundred nine".