398438664 has 64 divisors (see below), whose sum is σ = 1129195200. Its totient is φ = 116142336.

The previous prime is 398438647. The next prime is 398438713. The reversal of 398438664 is 466834893.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27679 + ... + 39534.

It is an arithmetic number, because the mean of its divisors is an integer number (17643675).

Almost surely, 2^398438664 is an apocalyptic number.

It is an amenable number.

398438664 is an abundant number, since it is smaller than the sum of its proper divisors (730756536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

398438664 is a wasteful number, since it uses less digits than its factorization.

398438664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67254 (or 67250 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 51.

The square root of 398438664 is about 19960.9284353208. The cubic root of 398438664 is about 735.8463811791.

The spelling of 398438664 in words is "three hundred ninety-eight million, four hundred thirty-eight thousand, six hundred sixty-four".