18998244 has 18 divisors (see below), whose sum is σ = 48023430. Its totient is φ = 6332736.

The previous prime is 18998209. The next prime is 18998249. The reversal of 18998244 is 44289981.

It can be written as a sum of positive squares in only one way, i.e., 9998244 + 9000000 = 3162^2 + 3000^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 18998244.

It is not an unprimeable number, because it can be changed into a prime (18998249) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 263829 + ... + 263900.

Almost surely, 2^18998244 is an apocalyptic number.

It is an amenable number.

18998244 is an abundant number, since it is smaller than the sum of its proper divisors (29025186).

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

18998244 is a wasteful number, since it uses less digits than its factorization.

18998244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527739 (or 527734 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 18998244 is about 4358.6975118721. The cubic root of 18998244 is about 266.8319440693.

The spelling of 18998244 in words is "eighteen million, nine hundred ninety-eight thousand, two hundred forty-four".