399245766943 has 2 divisors, whose sum is σ = 399245766944. Its totient is φ = 399245766942.

The previous prime is 399245766893. The next prime is 399245766949. The reversal of 399245766943 is 349667542993.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399245766943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399245766949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199622883471 + 199622883472.

It is an arithmetic number, because the mean of its divisors is an integer number (199622883472).

Almost surely, 2^399245766943 is an apocalyptic number.

399245766943 is a deficient number, since it is larger than the sum of its proper divisors (1).

399245766943 is an equidigital number, since it uses as much as digits as its factorization.

399245766943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 264539520, while the sum is 67.

The spelling of 399245766943 in words is "three hundred ninety-nine billion, two hundred forty-five million, seven hundred sixty-six thousand, nine hundred forty-three".