398858 has 4 divisors (see below), whose sum is σ = 598290. Its totient is φ = 199428.

The previous prime is 398857. The next prime is 398863. The reversal of 398858 is 858893.

398858 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 344569 + 54289 = 587^2 + 233^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 398858.

It is not an unprimeable number, because it can be changed into a prime (398857) 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 as a sum of consecutive naturals, namely, 99713 + ... + 99716.

2³⁹⁸⁸⁵⁸ is an apocalyptic number.

398858 is a deficient number, since it is larger than the sum of its proper divisors (199432).

398858 is a wasteful number, since it uses less digits than its factorization.

398858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199431.

The product of its digits is 69120, while the sum is 41.

The square root of 398858 is about 631.5520564451. The cubic root of 398858 is about 73.6104437369.

It can be divided in two parts, 39885 and 8, that added together give a palindrome (39893).

The spelling of 398858 in words is "three hundred ninety-eight thousand, eight hundred fifty-eight".