39394309 has 2 divisors, whose sum is σ = 39394310. Its totient is φ = 39394308.

The previous prime is 39394249. The next prime is 39394339. The reversal of 39394309 is 90349393.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37761025 + 1633284 = 6145^2 + 1278^2 .

It is a cyclic number.

It is not a de Polignac number, because 39394309 - 2⁷ = 39394181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39394339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19697154 + 19697155.

It is an arithmetic number, because the mean of its divisors is an integer number (19697155).

Almost surely, 2^39394309 is an apocalyptic number.

It is an amenable number.

39394309 is a deficient number, since it is larger than the sum of its proper divisors (1).

39394309 is an equidigital number, since it uses as much as digits as its factorization.

39394309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 78732, while the sum is 40.

The square root of 39394309 is about 6276.4885883749. The cubic root of 39394309 is about 340.2602073828.

The spelling of 39394309 in words is "thirty-nine million, three hundred ninety-four thousand, three hundred nine".