39680009 has 2 divisors, whose sum is σ = 39680010. Its totient is φ = 39680008.

The previous prime is 39679993. The next prime is 39680051. The reversal of 39680009 is 90008693.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25452025 + 14227984 = 5045^2 + 3772^2 .

It is a cyclic number.

It is not a de Polignac number, because 39680009 - 2⁴ = 39679993 is a prime.

It is a super-2 number, since 2×39680009² = 3149006228480162, which contains 22 as substring.

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 (39680089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19840004 + 19840005.

It is an arithmetic number, because the mean of its divisors is an integer number (19840005).

Almost surely, 2^39680009 is an apocalyptic number.

It is an amenable number.

39680009 is a deficient number, since it is larger than the sum of its proper divisors (1).

39680009 is an equidigital number, since it uses as much as digits as its factorization.

39680009 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 39680009 is about 6299.2070135851. The cubic root of 39680009 is about 341.0807851186.

The spelling of 39680009 in words is "thirty-nine million, six hundred eighty thousand, nine".