399513663 has 24 divisors (see below), whose sum is σ = 586703520. Its totient is φ = 261918720.

The previous prime is 399513659. The next prime is 399513691. The reversal of 399513663 is 366315993.

It is not a de Polignac number, because 399513663 - 2² = 399513659 is a prime.

It is a super-2 number, since 2×399513663² = 319222333847355138, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399513623) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 429583 + ... + 430511.

It is an arithmetic number, because the mean of its divisors is an integer number (24445980).

Almost surely, 2^399513663 is an apocalyptic number.

399513663 is a deficient number, since it is larger than the sum of its proper divisors (187189857).

399513663 is a wasteful number, since it uses less digits than its factorization.

399513663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1679 (or 1676 counting only the distinct ones).

The product of its digits is 393660, while the sum is 45.

The square root of 399513663 is about 19987.8378770691. The cubic root of 399513663 is about 736.5075651528.

The spelling of 399513663 in words is "three hundred ninety-nine million, five hundred thirteen thousand, six hundred sixty-three".