39789913 has 2 divisors, whose sum is σ = 39789914. Its totient is φ = 39789912.

The previous prime is 39789907. The next prime is 39789929. The reversal of 39789913 is 31998793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39778249 + 11664 = 6307^2 + 108^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39789913 is a prime.

It is not a weakly prime, because it can be changed into another prime (39789313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19894956 + 19894957.

It is an arithmetic number, because the mean of its divisors is an integer number (19894957).

Almost surely, 2^39789913 is an apocalyptic number.

It is an amenable number.

39789913 is a deficient number, since it is larger than the sum of its proper divisors (1).

39789913 is an equidigital number, since it uses as much as digits as its factorization.

39789913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 367416, while the sum is 49.

The square root of 39789913 is about 6307.9246190804. The cubic root of 39789913 is about 341.3953985099.

The spelling of 39789913 in words is "thirty-nine million, seven hundred eighty-nine thousand, nine hundred thirteen".