2165880 has 32 divisors (see below), whose sum is σ = 6498000. Its totient is φ = 577536.

The previous prime is 2165873. The next prime is 2165893. The reversal of 2165880 is 885612.

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 7 ways as a sum of consecutive naturals, for example, 8905 + ... + 9144.

2^2165880 is an apocalyptic number.

2165880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2165880 is an abundant number, since it is smaller than the sum of its proper divisors (4332120).

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

2165880 is a wasteful number, since it uses less digits than its factorization.

2165880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18063 (or 18059 counting only the distinct ones).

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

The square root of 2165880 is about 1471.6929027484. The cubic root of 2165880 is about 129.3832721262.

The spelling of 2165880 in words is "two million, one hundred sixty-five thousand, eight hundred eighty".