399018 has 16 divisors (see below), whose sum is σ = 809856. Its totient is φ = 131040.

The previous prime is 398989. The next prime is 399023. The reversal of 399018 is 810993.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18 + ... + 893.

It is an arithmetic number, because the mean of its divisors is an integer number (50616).

2³⁹⁹⁰¹⁸ is an apocalyptic number.

399018 is an abundant number, since it is smaller than the sum of its proper divisors (410838).

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

399018 is a wasteful number, since it uses less digits than its factorization.

399018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 989.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 399018 is about 631.6787158042. The cubic root of 399018 is about 73.6202852482.

The spelling of 399018 in words is "three hundred ninety-nine thousand, eighteen".