18229900 has 72 divisors (see below), whose sum is σ = 43868720. Its totient is φ = 6531840.

The previous prime is 18229877. The next prime is 18229901. The reversal of 18229900 is 992281.

It is not an unprimeable number, because it can be changed into a prime (18229901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47911 + ... + 48289.

Almost surely, 2^18229900 is an apocalyptic number.

18229900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18229900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21934360).

18229900 is an abundant number, since it is smaller than the sum of its proper divisors (25638820).

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

18229900 is a wasteful number, since it uses less digits than its factorization.

18229900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443 (or 436 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 18229900 is about 4269.6486974926. The cubic root of 18229900 is about 263.1851789956.

The spelling of 18229900 in words is "eighteen million, two hundred twenty-nine thousand, nine hundred".