18112500 has 216 divisors, whose sum is σ = 68245632. Its totient is φ = 3960000.

The previous prime is 18112487. The next prime is 18112511. The reversal of 18112500 is 521181.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 787489 + ... + 787511.

It is an arithmetic number, because the mean of its divisors is an integer number (315952).

Almost surely, 2^18112500 is an apocalyptic number.

18112500 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 18112500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34122816).

18112500 is an abundant number, since it is smaller than the sum of its proper divisors (50133132).

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

18112500 is a wasteful number, since it uses less digits than its factorization.

18112500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65 (or 40 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 18112500 is about 4255.8782877333. The cubic root of 18112500 is about 262.6189936700.

Adding to 18112500 its reverse (521181), we get a palindrome (18633681).

The spelling of 18112500 in words is "eighteen million, one hundred twelve thousand, five hundred".