18398163 has 8 divisors (see below), whose sum is σ = 28035328. Its totient is φ = 10513224.

The previous prime is 18398161. The next prime is 18398167. The reversal of 18398163 is 36189381.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18398163 - 2¹ = 18398161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18398161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 438031 + ... + 438072.

It is an arithmetic number, because the mean of its divisors is an integer number (3504416).

Almost surely, 2^18398163 is an apocalyptic number.

18398163 is a deficient number, since it is larger than the sum of its proper divisors (9637165).

18398163 is an equidigital number, since it uses as much as digits as its factorization.

18398163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876113.

The product of its digits is 31104, while the sum is 39.

The square root of 18398163 is about 4289.3079861442. The cubic root of 18398163 is about 263.9924383739.

It can be divided in two parts, 183 and 98163, that added together give a triangular number (98346 = T₄₄₃).

The spelling of 18398163 in words is "eighteen million, three hundred ninety-eight thousand, one hundred sixty-three".