399856763 has 2 divisors, whose sum is σ = 399856764. Its totient is φ = 399856762.

The previous prime is 399856759. The next prime is 399856783. The reversal of 399856763 is 367658993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399856763 - 2² = 399856759 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 399856699 and 399856708.

It is not a weakly prime, because it can be changed into another prime (399856703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199928381 + 199928382.

It is an arithmetic number, because the mean of its divisors is an integer number (199928382).

Almost surely, 2^399856763 is an apocalyptic number.

399856763 is a deficient number, since it is larger than the sum of its proper divisors (1).

399856763 is an equidigital number, since it uses as much as digits as its factorization.

399856763 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7348320, while the sum is 56.

The square root of 399856763 is about 19996.4187543670. The cubic root of 399856763 is about 736.7183409582.

The spelling of 399856763 in words is "three hundred ninety-nine million, eight hundred fifty-six thousand, seven hundred sixty-three".