399894666 has 16 divisors (see below), whose sum is σ = 801576000. Its totient is φ = 133000448.

The previous prime is 399894623. The next prime is 399894667. The reversal of 399894666 is 666498993.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (399894667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71526 + ... + 76913.

It is an arithmetic number, because the mean of its divisors is an integer number (50098500).

Almost surely, 2^399894666 is an apocalyptic number.

399894666 is an abundant number, since it is smaller than the sum of its proper divisors (401681334).

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

399894666 is a wasteful number, since it uses less digits than its factorization.

399894666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148893.

The product of its digits is 15116544, while the sum is 60.

The square root of 399894666 is about 19997.3664766139. The cubic root of 399894666 is about 736.7416184211.

The spelling of 399894666 in words is "three hundred ninety-nine million, eight hundred ninety-four thousand, six hundred sixty-six".