18015000 has 80 divisors (see below), whose sum is σ = 56325720. Its totient is φ = 4800000.

The previous prime is 18014987. The next prime is 18015017. The reversal of 18015000 is 51081.

It is a happy number.

18015000 is nontrivially palindromic in base 7.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14400 + ... + 15600.

Almost surely, 2^18015000 is an apocalyptic number.

18015000 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 18015000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28162860).

18015000 is an abundant number, since it is smaller than the sum of its proper divisors (38310720).

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

18015000 is a wasteful number, since it uses less digits than its factorization.

18015000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1230 (or 1211 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 18015000 is about 4244.4080859408. The cubic root of 18015000 is about 262.1469175805.

Adding to 18015000 its reverse (51081), we get a palindrome (18066081).

The spelling of 18015000 in words is "eighteen million, fifteen thousand".