399998000 has 40 divisors (see below), whose sum is σ = 967200000. Its totient is φ = 159998400.

The previous prime is 399997987. The next prime is 399998021. The reversal of 399998000 is 899993.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98000 + ... + 101999.

It is an arithmetic number, because the mean of its divisors is an integer number (24180000).

Almost surely, 2^399998000 is an apocalyptic number.

It is an amenable number.

399998000 is an abundant number, since it is smaller than the sum of its proper divisors (567202000).

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

399998000 is a wasteful number, since it uses less digits than its factorization.

399998000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200022 (or 200006 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 47.

The square root of 399998000 is about 19999.9499999375. The cubic root of 399998000 is about 736.8050717155.

The spelling of 399998000 in words is "three hundred ninety-nine million, nine hundred ninety-eight thousand".