398659 has 4 divisors (see below), whose sum is σ = 416016. Its totient is φ = 381304.

The previous prime is 398627. The next prime is 398669. The reversal of 398659 is 956893.

398659 is nontrivially palindromic in base 2.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 398659 - 2⁵ = 398627 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398609) 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, 8644 + ... + 8689.

It is an arithmetic number, because the mean of its divisors is an integer number (104004).

2³⁹⁸⁶⁵⁹ is an apocalyptic number.

398659 is a deficient number, since it is larger than the sum of its proper divisors (17357).

398659 is a wasteful number, since it uses less digits than its factorization.

398659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17356.

The product of its digits is 58320, while the sum is 40.

The square root of 398659 is about 631.3944884143. The cubic root of 398659 is about 73.5981996842.

The spelling of 398659 in words is "three hundred ninety-eight thousand, six hundred fifty-nine".