2181398800 has 120 divisors (see below), whose sum is σ = 6009186816. Its totient is φ = 745451520.

The previous prime is 2181398777. The next prime is 2181398819. The reversal of 2181398800 is 88931812.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 987297 + ... + 989503.

Almost surely, 2^2181398800 is an apocalyptic number.

2181398800 is a gapful number since it is divisible by the number (20) 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 2181398800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3004593408).

2181398800 is an abundant number, since it is smaller than the sum of its proper divisors (3827788016).

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

2181398800 is a wasteful number, since it uses less digits than its factorization.

2181398800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2585 (or 2574 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 40.

The square root of 2181398800 is about 46705.4472197837. The cubic root of 2181398800 is about 1296.9155275863.

The spelling of 2181398800 in words is "two billion, one hundred eighty-one million, three hundred ninety-eight thousand, eight hundred".