2181741840 has 60 divisors (see below), whose sum is σ = 7327018764. Its totient is φ = 581797632.

The previous prime is 2181741827. The next prime is 2181741907. The reversal of 2181741840 is 481471812.

It can be written as a sum of positive squares in 2 ways, for example, as 393466896 + 1788274944 = 19836^2 + 42288^2 .

It is a tau number, because it is divible by the number of its divisors (60).

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

It is a junction number, because it is equal to n+sod(n) for n = 2181741795 and 2181741804.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1514379 + ... + 1515818.

Almost surely, 2^2181741840 is an apocalyptic number.

2181741840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2181741840 is an abundant number, since it is smaller than the sum of its proper divisors (5145276924).

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

2181741840 is a wasteful number, since it uses less digits than its factorization.

2181741840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3030216 (or 3030207 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 2181741840 is about 46709.1194522012. The cubic root of 2181741840 is about 1296.9835069922.

The spelling of 2181741840 in words is "two billion, one hundred eighty-one million, seven hundred forty-one thousand, eight hundred forty".