18375000 has 168 divisors, whose sum is σ = 66796020. Its totient is φ = 4200000.

The previous prime is 18374987. The next prime is 18375053. The reversal of 18375000 is 57381.

It is a tau number, because it is divible by the number of its divisors (168).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 2624997 + ... + 2625003.

Almost surely, 2^18375000 is an apocalyptic number.

18375000 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 18375000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33398010).

18375000 is an abundant number, since it is smaller than the sum of its proper divisors (48421020).

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

18375000 is an frugal number, since it uses more digits than its factorization.

18375000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53 (or 17 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 18375000 is about 4286.6070498706. The cubic root of 18375000 is about 263.8816043952.

Multiplying 18375000 by its sum of digits (24), we get a square (441000000 = 21000²).

18375000 divided by its sum of digits (24) gives a square (765625 = 875²).

The spelling of 18375000 in words is "eighteen million, three hundred seventy-five thousand".