398990 has 16 divisors (see below), whose sum is σ = 760752. Its totient is φ = 150144.

The previous prime is 398989. The next prime is 399023. The reversal of 398990 is 99893.

It is a congruent 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, 1004 + ... + 1343.

It is an arithmetic number, because the mean of its divisors is an integer number (47547).

2³⁹⁸⁹⁹⁰ is an apocalyptic number.

398990 is a deficient number, since it is larger than the sum of its proper divisors (361762).

398990 is a wasteful number, since it uses less digits than its factorization.

398990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2371.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 398990 is about 631.6565522497. The cubic root of 398990 is about 73.6185631737.

The spelling of 398990 in words is "three hundred ninety-eight thousand, nine hundred ninety".