39909907 has 2 divisors, whose sum is σ = 39909908. Its totient is φ = 39909906.

The previous prime is 39909839. The next prime is 39909911. The reversal of 39909907 is 70990993.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39909907 is a prime.

It is not a weakly prime, because it can be changed into another prime (39909917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19954953 + 19954954.

It is an arithmetic number, because the mean of its divisors is an integer number (19954954).

Almost surely, 2^39909907 is an apocalyptic number.

39909907 is a deficient number, since it is larger than the sum of its proper divisors (1).

39909907 is an equidigital number, since it uses as much as digits as its factorization.

39909907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 137781, while the sum is 46.

The square root of 39909907 is about 6317.4288282497. The cubic root of 39909907 is about 341.7382348854.

The spelling of 39909907 in words is "thirty-nine million, nine hundred nine thousand, nine hundred seven".