2159680 has 56 divisors (see below), whose sum is σ = 5458968. Its totient is φ = 811008.

The previous prime is 2159671. The next prime is 2159681. The reversal of 2159680 is 869512.

It can be written as a sum of positive squares in 4 ways, for example, as 602176 + 1557504 = 776^2 + 1248^2 .

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2159681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5242 + ... + 5638.

2^2159680 is an apocalyptic number.

2159680 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 2159680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2729484).

2159680 is an abundant number, since it is smaller than the sum of its proper divisors (3299288).

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

2159680 is a wasteful number, since it uses less digits than its factorization.

2159680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431 (or 421 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 2159680 is about 1469.5849754267. The cubic root of 2159680 is about 129.2596975765.

The spelling of 2159680 in words is "two million, one hundred fifty-nine thousand, six hundred eighty".