1800018288 has 100 divisors (see below), whose sum is σ = 5230574448. Its totient is φ = 597611520.

The previous prime is 1800018271. The next prime is 1800018299. The reversal of 1800018288 is 8828100081.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 338208 + ... + 343488.

Almost surely, 2^1800018288 is an apocalyptic number.

1800018288 is a gapful number since it is divisible by the number (18) 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 1800018288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2615287224).

1800018288 is an abundant number, since it is smaller than the sum of its proper divisors (3430556160).

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

1800018288 is a wasteful number, since it uses less digits than its factorization.

1800018288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5564 (or 5549 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 36.

The square root of 1800018288 is about 42426.6223967923. The cubic root of 1800018288 is about 1216.4445187789. Note that the first 3 decimals are identical.

The spelling of 1800018288 in words is "one billion, eight hundred million, eighteen thousand, two hundred eighty-eight".