2156880 has 160 divisors (see below), whose sum is σ = 7856640. Its totient is φ = 483840.

The previous prime is 2156879. The next prime is 2156897. The reversal of 2156880 is 886512.

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

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, 50139 + ... + 50181.

It is an arithmetic number, because the mean of its divisors is an integer number (49104).

2^2156880 is an apocalyptic number.

2156880 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 2156880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3928320).

2156880 is an abundant number, since it is smaller than the sum of its proper divisors (5699760).

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

2156880 is a wasteful number, since it uses less digits than its factorization.

2156880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89 (or 83 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 2156880 is about 1468.6320165378. The cubic root of 2156880 is about 129.2038121864.

The spelling of 2156880 in words is "two million, one hundred fifty-six thousand, eight hundred eighty".