18398196 has 18 divisors (see below), whose sum is σ = 46506642. Its totient is φ = 6132720.

The previous prime is 18398167. The next prime is 18398201. The reversal of 18398196 is 69189381.

18398196 is nontrivially palindromic in base 5.

It can be written as a sum of positive squares in only one way, i.e., 9217296 + 9180900 = 3036^2 + 3030^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 255495 + ... + 255566.

Almost surely, 2^18398196 is an apocalyptic number.

It is an amenable number.

18398196 is an abundant number, since it is smaller than the sum of its proper divisors (28108446).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18398196 is a wasteful number, since it uses less digits than its factorization.

18398196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511071 (or 511066 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 18398196 is about 4289.3118329168. The cubic root of 18398196 is about 263.9925962111.

The spelling of 18398196 in words is "eighteen million, three hundred ninety-eight thousand, one hundred ninety-six".