1800418890 has 64 divisors (see below), whose sum is σ = 4590898560. Its totient is φ = 451019520.

The previous prime is 1800418889. The next prime is 1800418913. The reversal of 1800418890 is 988140081.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4225 + ... + 60155.

It is an arithmetic number, because the mean of its divisors is an integer number (71732790).

Almost surely, 2^1800418890 is an apocalyptic number.

1800418890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1800418890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2295449280).

1800418890 is an abundant number, since it is smaller than the sum of its proper divisors (2790479670).

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

1800418890 is a wasteful number, since it uses less digits than its factorization.

1800418890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56007.

The product of its (nonzero) digits is 18432, while the sum is 39.

The square root of 1800418890 is about 42431.3432500080. The cubic root of 1800418890 is about 1216.5347537807.

The spelling of 1800418890 in words is "one billion, eight hundred million, four hundred eighteen thousand, eight hundred ninety".