398163 has 4 divisors (see below), whose sum is σ = 530888. Its totient is φ = 265440.

The previous prime is 398149. The next prime is 398171. The reversal of 398163 is 361893.

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

It is not a de Polignac number, because 398163 - 2⁸ = 397907 is a prime.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 398163.

It is not an unprimeable number, because it can be changed into a prime (398113) 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, 66358 + ... + 66363.

It is an arithmetic number, because the mean of its divisors is an integer number (132722).

2³⁹⁸¹⁶³ is an apocalyptic number.

398163 is a deficient number, since it is larger than the sum of its proper divisors (132725).

398163 is a wasteful number, since it uses less digits than its factorization.

398163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132724.

The product of its digits is 3888, while the sum is 30.

The square root of 398163 is about 631.0015847841. The cubic root of 398163 is about 73.5676640996.

It can be divided in two parts, 398 and 163, that added together give a triangular number (561 = T₃₃).

The spelling of 398163 in words is "three hundred ninety-eight thousand, one hundred sixty-three".