398089 has 4 divisors (see below), whose sum is σ = 421524. Its totient is φ = 374656.

The previous prime is 398087. The next prime is 398113. The reversal of 398089 is 980893.

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

It can be written as a sum of positive squares in 2 ways, for example, as 242064 + 156025 = 492^2 + 395^2 .

It is a cyclic number.

It is not a de Polignac number, because 398089 - 2¹ = 398087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11692 + ... + 11725.

It is an arithmetic number, because the mean of its divisors is an integer number (105381).

2³⁹⁸⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

398089 is a deficient number, since it is larger than the sum of its proper divisors (23435).

398089 is a wasteful number, since it uses less digits than its factorization.

398089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23434.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 398089 is about 630.9429451226. The cubic root of 398089 is about 73.5631062138.

It can be divided in two parts, 39 and 8089, that added together give a triangular number (8128 = T₁₂₇).

The spelling of 398089 in words is "three hundred ninety-eight thousand, eighty-nine".