18750000 has 90 divisors (see below), whose sum is σ = 60546844. Its totient is φ = 5000000.

The previous prime is 18749993. The next prime is 18750001. The reversal of 18750000 is 5781.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18750001) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3749998 + ... + 3750002.

Almost surely, 2^18750000 is an apocalyptic number.

18750000 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 18750000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30273422).

18750000 is an abundant number, since it is smaller than the sum of its proper divisors (41796844).

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

18750000 is an frugal number, since it uses more digits than its factorization.

18750000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51 (or 10 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 18750000 is about 4330.1270189222. The cubic root of 18750000 is about 265.6646422957.

Adding to 18750000 its reverse (5781), we get a palindrome (18755781).

The spelling of 18750000 in words is "eighteen million, seven hundred fifty thousand".