2187720 has 96 divisors (see below), whose sum is σ = 7300800. Its totient is φ = 567936.

The previous prime is 2187707. The next prime is 2187727. The reversal of 2187720 is 277812.

It is a super-2 number, since 2×2187720² = 9572237596800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2187727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21189 + ... + 21291.

It is an arithmetic number, because the mean of its divisors is an integer number (76050).

2^2187720 is an apocalyptic number.

2187720 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 2187720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3650400).

2187720 is an abundant number, since it is smaller than the sum of its proper divisors (5113080).

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

2187720 is a wasteful number, since it uses less digits than its factorization.

2187720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179 (or 172 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 2187720 is about 1479.0943174794. The cubic root of 2187720 is about 129.8167042050.

The spelling of 2187720 in words is "two million, one hundred eighty-seven thousand, seven hundred twenty".