18012080 has 40 divisors (see below), whose sum is σ = 42576144. Its totient is φ = 7084800.

The previous prime is 18012073. The next prime is 18012083. The reversal of 18012080 is 8021081.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18012083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3035 + ... + 6725.

Almost surely, 2^18012080 is an apocalyptic number.

18012080 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 18012080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21288072).

18012080 is an abundant number, since it is smaller than the sum of its proper divisors (24564064).

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

18012080 is a wasteful number, since it uses less digits than its factorization.

18012080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3765 (or 3759 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 18012080 is about 4244.0640899968. The cubic root of 18012080 is about 262.1327532663.

Subtracting from 18012080 its reverse (8021081), we obtain a palindrome (9990999).

The spelling of 18012080 in words is "eighteen million, twelve thousand, eighty".