398589 has 4 divisors (see below), whose sum is σ = 531456. Its totient is φ = 265724.

The previous prime is 398581. The next prime is 398591. The reversal of 398589 is 985893.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 398589 - 2³ = 398581 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 398589.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398581) 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, 66429 + ... + 66434.

It is an arithmetic number, because the mean of its divisors is an integer number (132864).

2³⁹⁸⁵⁸⁹ is an apocalyptic number.

It is an amenable number.

398589 is a deficient number, since it is larger than the sum of its proper divisors (132867).

398589 is a wasteful number, since it uses less digits than its factorization.

398589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132866.

The product of its digits is 77760, while the sum is 42.

The square root of 398589 is about 631.3390531244. The cubic root of 398589 is about 73.5938917623.

It can be divided in two parts, 39 and 8589, that multiplied together give a triangular number (334971 = T₈₁₈).

The spelling of 398589 in words is "three hundred ninety-eight thousand, five hundred eighty-nine".