2157760 has 56 divisors (see below), whose sum is σ = 5614416. Its totient is φ = 783360.

The previous prime is 2157739. The next prime is 2157763. The reversal of 2157760 is 677512.

It is not an unprimeable number, because it can be changed into a prime (2157763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3214 + ... + 3826.

2^2157760 is an apocalyptic number.

2157760 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 2157760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2807208).

2157760 is an abundant number, since it is smaller than the sum of its proper divisors (3456656).

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

2157760 is a wasteful number, since it uses less digits than its factorization.

2157760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641 (or 631 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 2157760 is about 1468.9315845199. The cubic root of 2157760 is about 129.2213813751.

The spelling of 2157760 in words is "two million, one hundred fifty-seven thousand, seven hundred sixty".