39494857 has 2 divisors, whose sum is σ = 39494858. Its totient is φ = 39494856.

The previous prime is 39494843. The next prime is 39494867. The reversal of 39494857 is 75849493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22429696 + 17065161 = 4736^2 + 4131^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39494857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39494857.

It is not a weakly prime, because it can be changed into another prime (39494867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19747428 + 19747429.

It is an arithmetic number, because the mean of its divisors is an integer number (19747429).

Almost surely, 2^39494857 is an apocalyptic number.

It is an amenable number.

39494857 is a deficient number, since it is larger than the sum of its proper divisors (1).

39494857 is an equidigital number, since it uses as much as digits as its factorization.

39494857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 49.

The square root of 39494857 is about 6284.4933765579. The cubic root of 39494857 is about 340.5494489679.

The spelling of 39494857 in words is "thirty-nine million, four hundred ninety-four thousand, eight hundred fifty-seven".