2181560 has 16 divisors (see below), whose sum is σ = 4908600. Its totient is φ = 872608.

The previous prime is 2181551. The next prime is 2181577. The reversal of 2181560 is 651812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27230 + ... + 27309.

2^2181560 is an apocalyptic number.

2181560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2181560 is an abundant number, since it is smaller than the sum of its proper divisors (2727040).

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

2181560 is a wasteful number, since it uses less digits than its factorization.

2181560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54550 (or 54546 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 2181560 is about 1477.0104942078. The cubic root of 2181560 is about 129.6947473087.

The spelling of 2181560 in words is "two million, one hundred eighty-one thousand, five hundred sixty".