398959 has 4 divisors (see below), whose sum is σ = 435240. Its totient is φ = 362680.

The previous prime is 398941. The next prime is 398969. The reversal of 398959 is 959893.

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 398959 - 2¹⁷ = 267887 is a prime.

It is a Duffinian number.

398959 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18124 + ... + 18145.

It is an arithmetic number, because the mean of its divisors is an integer number (108810).

2³⁹⁸⁹⁵⁹ is an apocalyptic number.

398959 is a deficient number, since it is larger than the sum of its proper divisors (36281).

398959 is a wasteful number, since it uses less digits than its factorization.

398959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36280.

The product of its digits is 87480, while the sum is 43.

The square root of 398959 is about 631.6320131216. The cubic root of 398959 is about 73.6166564972.

It can be divided in two parts, 39 and 8959, that added together give a palindrome (8998).

The spelling of 398959 in words is "three hundred ninety-eight thousand, nine hundred fifty-nine".