18045780 has 48 divisors (see below), whose sum is σ = 51293760. Its totient is φ = 4740384.

The previous prime is 18045773. The next prime is 18045787. The reversal of 18045780 is 8754081.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18045773) and next prime (18045787).

It is a Saint-Exupery number, since it is equal to the product of the sides of a Pythagorean triangle: 335 × 201 × 268.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18045787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 269307 + ... + 269373.

It is an arithmetic number, because the mean of its divisors is an integer number (1068620).

Almost surely, 2^18045780 is an apocalyptic number.

18045780 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 18045780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25646880).

18045780 is an abundant number, since it is smaller than the sum of its proper divisors (33247980).

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

18045780 is an frugal number, since it uses more digits than its factorization.

18045780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 18045780 is about 4248.0324857515. The cubic root of 18045780 is about 262.2961319583.

The spelling of 18045780 in words is "eighteen million, forty-five thousand, seven hundred eighty".