18099800 has 24 divisors (see below), whose sum is σ = 42082500. Its totient is φ = 7239840.

The previous prime is 18099793. The next prime is 18099803. The reversal of 18099800 is 899081.

It is a happy number.

It is a super-3 number, since 3×18099800³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18099803) 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, 45050 + ... + 45449.

Almost surely, 2^18099800 is an apocalyptic number.

18099800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18099800 is an abundant number, since it is smaller than the sum of its proper divisors (23982700).

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

18099800 is a wasteful number, since it uses less digits than its factorization.

18099800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90515 (or 90506 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 18099800 is about 4254.3859721469. The cubic root of 18099800 is about 262.5575988495.

The spelling of 18099800 in words is "eighteen million, ninety-nine thousand, eight hundred".