39664957 has 2 divisors, whose sum is σ = 39664958. Its totient is φ = 39664956.

The previous prime is 39664943. The next prime is 39664969. The reversal of 39664957 is 75946693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32936121 + 6728836 = 5739^2 + 2594^2 .

It is an emirp because it is prime and its reverse (75946693) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39664957 - 2¹⁵ = 39632189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39664957.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39664907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19832478 + 19832479.

It is an arithmetic number, because the mean of its divisors is an integer number (19832479).

Almost surely, 2^39664957 is an apocalyptic number.

It is an amenable number.

39664957 is a deficient number, since it is larger than the sum of its proper divisors (1).

39664957 is an equidigital number, since it uses as much as digits as its factorization.

39664957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1224720, while the sum is 49.

The square root of 39664957 is about 6298.0121467015. The cubic root of 39664957 is about 341.0376517507.

The spelling of 39664957 in words is "thirty-nine million, six hundred sixty-four thousand, nine hundred fifty-seven".