398890 has 16 divisors (see below), whose sum is σ = 726408. Its totient is φ = 157696.

The previous prime is 398887. The next prime is 398903. The reversal of 398890 is 98893.

398890 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 178929 + 219961 = 423^2 + 469^2 .

It is a super-2 number, since 2×398890² = 318226464200, which contains 22 as substring.

It is a nialpdrome in base 14.

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, 954 + ... + 1306.

2³⁹⁸⁸⁹⁰ is an apocalyptic number.

398890 is a deficient number, since it is larger than the sum of its proper divisors (327518).

398890 is a wasteful number, since it uses less digits than its factorization.

398890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 398890 is about 631.5773903490. The cubic root of 398890 is about 73.6124122497.

The spelling of 398890 in words is "three hundred ninety-eight thousand, eight hundred ninety".