398859 has 4 divisors (see below), whose sum is σ = 531816. Its totient is φ = 265904.

The previous prime is 398857. The next prime is 398863. The reversal of 398859 is 958893.

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 398859 - 2¹ = 398857 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 398859.

It is not an unprimeable number, because it can be changed into a prime (398857) 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, 66474 + ... + 66479.

It is an arithmetic number, because the mean of its divisors is an integer number (132954).

2³⁹⁸⁸⁵⁹ is an apocalyptic number.

398859 is a deficient number, since it is larger than the sum of its proper divisors (132957).

398859 is a wasteful number, since it uses less digits than its factorization.

398859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132956.

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

The square root of 398859 is about 631.5528481450. The cubic root of 398859 is about 73.6105052546.

The spelling of 398859 in words is "three hundred ninety-eight thousand, eight hundred fifty-nine".