398888866 has 8 divisors (see below), whose sum is σ = 599409180. Its totient is φ = 199085808.

The previous prime is 398888857. The next prime is 398888887. The reversal of 398888866 is 668888893.

It can be written as a sum of positive squares in 2 ways, for example, as 338376025 + 60512841 = 18395^2 + 7779^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×398888866² = 318224654837531912, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 398888798 and 398888807.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177921 + ... + 180148.

Almost surely, 2^398888866 is an apocalyptic number.

398888866 is a deficient number, since it is larger than the sum of its proper divisors (200520314).

398888866 is a wasteful number, since it uses less digits than its factorization.

398888866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358628.

The product of its digits is 31850496, while the sum is 64.

The square root of 398888866 is about 19972.2023322417. The cubic root of 398888866 is about 736.1234249235.

The spelling of 398888866 in words is "three hundred ninety-eight million, eight hundred eighty-eight thousand, eight hundred sixty-six".