18228900 has 36 divisors (see below), whose sum is σ = 52743152. Its totient is φ = 4860960.

The previous prime is 18228893. The next prime is 18228937. The reversal of 18228900 is 982281.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30082 + ... + 30681.

Almost surely, 2^18228900 is an apocalyptic number.

18228900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18228900 is an abundant number, since it is smaller than the sum of its proper divisors (34514252).

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

18228900 is a wasteful number, since it uses less digits than its factorization.

18228900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60780 (or 60773 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 18228900 is about 4269.5315902333. The cubic root of 18228900 is about 263.1803665722.

The spelling of 18228900 in words is "eighteen million, two hundred twenty-eight thousand, nine hundred".