399263713 has 2 divisors, whose sum is σ = 399263714. Its totient is φ = 399263712.

The previous prime is 399263659. The next prime is 399263747. The reversal of 399263713 is 317362993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 399080529 + 183184 = 19977^2 + 428^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399263713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 399263713.

It is not a weakly prime, because it can be changed into another prime (399264713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199631856 + 199631857.

It is an arithmetic number, because the mean of its divisors is an integer number (199631857).

Almost surely, 2^399263713 is an apocalyptic number.

It is an amenable number.

399263713 is a deficient number, since it is larger than the sum of its proper divisors (1).

399263713 is an equidigital number, since it uses as much as digits as its factorization.

399263713 is an evil number, because the sum of its binary digits is even.

The product of its digits is 183708, while the sum is 43.

The square root of 399263713 is about 19981.5843465927. The cubic root of 399263713 is about 736.3539379744.

The spelling of 399263713 in words is "three hundred ninety-nine million, two hundred sixty-three thousand, seven hundred thirteen".