2166720 has 112 divisors (see below), whose sum is σ = 7181088. Its totient is φ = 552960.

The previous prime is 2166709. The next prime is 2166721. The reversal of 2166720 is 276612.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35490 + ... + 35550.

2^2166720 is an apocalyptic number.

2166720 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 2166720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3590544).

2166720 is an abundant number, since it is smaller than the sum of its proper divisors (5014368).

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

2166720 is a wasteful number, since it uses less digits than its factorization.

2166720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118 (or 108 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 2166720 is about 1471.9782607090. The cubic root of 2166720 is about 129.3999963371.

The spelling of 2166720 in words is "two million, one hundred sixty-six thousand, seven hundred twenty".