2165988 has 48 divisors (see below), whose sum is σ = 5624640. Its totient is φ = 643200.

The previous prime is 2165971. The next prime is 2166007. The reversal of 2165988 is 8895612.

It is a super-2 number, since 2×2165988² = 9383008032288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7918 + ... + 8186.

It is an arithmetic number, because the mean of its divisors is an integer number (117180).

2^2165988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2165988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2812320).

2165988 is an abundant number, since it is smaller than the sum of its proper divisors (3458652).

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

2165988 is a wasteful number, since it uses less digits than its factorization.

2165988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348 (or 346 counting only the distinct ones).

The product of its digits is 34560, while the sum is 39.

The square root of 2165988 is about 1471.7295947286. The cubic root of 2165988 is about 129.3854226241.

The spelling of 2165988 in words is "two million, one hundred sixty-five thousand, nine hundred eighty-eight".