2163720 has 128 divisors (see below), whose sum is σ = 7459200. Its totient is φ = 497664.

The previous prime is 2163703. The next prime is 2163737. The reversal of 2163720 is 273612.

It is a happy number.

2163720 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2163703) and next prime (2163737).

It is a congruent 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, 29604 + ... + 29676.

It is an arithmetic number, because the mean of its divisors is an integer number (58275).

2^2163720 is an apocalyptic number.

2163720 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 2163720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3729600).

2163720 is an abundant number, since it is smaller than the sum of its proper divisors (5295480).

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

2163720 is a wasteful number, since it uses less digits than its factorization.

2163720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119 (or 115 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 2163720 is about 1470.9588709410. The cubic root of 2163720 is about 129.3402471476.

The spelling of 2163720 in words is "two million, one hundred sixty-three thousand, seven hundred twenty".