399331763 has 2 divisors, whose sum is σ = 399331764. Its totient is φ = 399331762.

The previous prime is 399331747. The next prime is 399331781. The reversal of 399331763 is 367133993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399331763 - 2⁴ = 399331747 is a prime.

It is not a weakly prime, because it can be changed into another prime (399331463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199665881 + 199665882.

It is an arithmetic number, because the mean of its divisors is an integer number (199665882).

Almost surely, 2^399331763 is an apocalyptic number.

399331763 is a deficient number, since it is larger than the sum of its proper divisors (1).

399331763 is an equidigital number, since it uses as much as digits as its factorization.

399331763 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 275562, while the sum is 44.

The square root of 399331763 is about 19983.2870919676. The cubic root of 399331763 is about 736.3957700078.

The spelling of 399331763 in words is "three hundred ninety-nine million, three hundred thirty-one thousand, seven hundred sixty-three".