398790 has 64 divisors (see below), whose sum is σ = 1221120. Its totient is φ = 90720.

The previous prime is 398771. The next prime is 398813. The reversal of 398790 is 97893.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1785 + ... + 1995.

It is an arithmetic number, because the mean of its divisors is an integer number (19080).

2³⁹⁸⁷⁹⁰ is an apocalyptic number.

398790 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 398790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (610560).

398790 is an abundant number, since it is smaller than the sum of its proper divisors (822330).

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

398790 is a wasteful number, since it uses less digits than its factorization.

398790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234 (or 228 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 398790 is about 631.4982185248. The cubic root of 398790 is about 73.6062602977.

The spelling of 398790 in words is "three hundred ninety-eight thousand, seven hundred ninety".