18072900 has 108 divisors (see below), whose sum is σ = 58090032. Its totient is φ = 4697280.

The previous prime is 18072893. The next prime is 18072911. The reversal of 18072900 is 927081.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 38467 + ... + 38933.

Almost surely, 2^18072900 is an apocalyptic number.

18072900 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 18072900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29045016).

18072900 is an abundant number, since it is smaller than the sum of its proper divisors (40017132).

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

18072900 is a wasteful number, since it uses less digits than its factorization.

18072900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530 (or 520 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 18072900 is about 4251.2233533420. The cubic root of 18072900 is about 262.4274629508.

Adding to 18072900 its reverse (927081), we get a palindrome (18999981).

The spelling of 18072900 in words is "eighteen million, seventy-two thousand, nine hundred".