398390 has 8 divisors (see below), whose sum is σ = 717120. Its totient is φ = 159352.

The previous prime is 398369. The next prime is 398393. The reversal of 398390 is 93893.

398390 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19910 + ... + 19929.

It is an arithmetic number, because the mean of its divisors is an integer number (89640).

2³⁹⁸³⁹⁰ is an apocalyptic number.

398390 is a deficient number, since it is larger than the sum of its proper divisors (318730).

398390 is a wasteful number, since it uses less digits than its factorization.

398390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39846.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 398390 is about 631.1814319195. The cubic root of 398390 is about 73.5816422000.

The spelling of 398390 in words is "three hundred ninety-eight thousand, three hundred ninety".