398865663 has 24 divisors (see below), whose sum is σ = 658975616. Its totient is φ = 227739600.

The previous prime is 398865653. The next prime is 398865683. The reversal of 398865663 is 366568893.

It is not a de Polignac number, because 398865663 - 2⁴ = 398865647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398865653) 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 in 23 ways as a sum of consecutive naturals, for example, 132768 + ... + 135738.

Almost surely, 2^398865663 is an apocalyptic number.

398865663 is a deficient number, since it is larger than the sum of its proper divisors (260109953).

398865663 is a wasteful number, since it uses less digits than its factorization.

398865663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5115 (or 5112 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 54.

The square root of 398865663 is about 19971.6214414353. The cubic root of 398865663 is about 736.1091514383.

The spelling of 398865663 in words is "three hundred ninety-eight million, eight hundred sixty-five thousand, six hundred sixty-three".