399820763 has 2 divisors, whose sum is σ = 399820764. Its totient is φ = 399820762.

The previous prime is 399820747. The next prime is 399820831. The reversal of 399820763 is 367028993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399820763 - 2⁴ = 399820747 is a prime.

It is not a weakly prime, because it can be changed into another prime (399823763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199910381 + 199910382.

It is an arithmetic number, because the mean of its divisors is an integer number (199910382).

Almost surely, 2^399820763 is an apocalyptic number.

399820763 is a deficient number, since it is larger than the sum of its proper divisors (1).

399820763 is an equidigital number, since it uses as much as digits as its factorization.

399820763 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 489888, while the sum is 47.

The square root of 399820763 is about 19995.5185729203. The cubic root of 399820763 is about 736.6962308271.

The spelling of 399820763 in words is "three hundred ninety-nine million, eight hundred twenty thousand, seven hundred sixty-three".