2157960 has 96 divisors (see below), whose sum is σ = 7551360. Its totient is φ = 491904.

The previous prime is 2157923. The next prime is 2157989. The reversal of 2157960 is 697512.

It is a Cunningham number, because it is equal to 1469²-1.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5697 + ... + 6063.

It is an arithmetic number, because the mean of its divisors is an integer number (78660).

2^2157960 is an apocalyptic number.

2157960 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 2157960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3775680).

2157960 is an abundant number, since it is smaller than the sum of its proper divisors (5393400).

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

2157960 is a wasteful number, since it uses less digits than its factorization.

2157960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395 (or 384 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 2157960 is about 1468.9996596324. Note that the first 3 decimals coincide. The cubic root of 2157960 is about 129.2253737064.

The spelling of 2157960 in words is "two million, one hundred fifty-seven thousand, nine hundred sixty".