1800918108 has 36 divisors (see below), whose sum is σ = 4966169208. Its totient is φ = 545732640.

The previous prime is 1800918089. The next prime is 1800918157. The reversal of 1800918108 is 8018190081.

It is a tau number, because it is divible by the number of its divisors (36).

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 11 ways as a sum of consecutive naturals, for example, 2273491 + ... + 2274282.

Almost surely, 2^1800918108 is an apocalyptic number.

1800918108 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1800918108 is an abundant number, since it is smaller than the sum of its proper divisors (3165251100).

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

1800918108 is a wasteful number, since it uses less digits than its factorization.

1800918108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4547794 (or 4547789 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 36.

The square root of 1800918108 is about 42437.2254983758. The cubic root of 1800918108 is about 1216.6471831579.

The spelling of 1800918108 in words is "one billion, eight hundred million, nine hundred eighteen thousand, one hundred eight".