939947909 has 2 divisors, whose sum is σ = 939947910. Its totient is φ = 939947908.

The previous prime is 939947903. The next prime is 939947933. The reversal of 939947909 is 909749939.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 861129025 + 78818884 = 29345^2 + 8878^2 .

It is a cyclic number.

It is not a de Polignac number, because 939947909 - 2⁴ = 939947893 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (939947903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 469973954 + 469973955.

It is an arithmetic number, because the mean of its divisors is an integer number (469973955).

Almost surely, 2^939947909 is an apocalyptic number.

It is an amenable number.

939947909 is a deficient number, since it is larger than the sum of its proper divisors (1).

939947909 is an equidigital number, since it uses as much as digits as its factorization.

939947909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4960116, while the sum is 59.

The square root of 939947909 is about 30658.5699112010. The cubic root of 939947909 is about 979.5680134806.

The spelling of 939947909 in words is "nine hundred thirty-nine million, nine hundred forty-seven thousand, nine hundred nine".