2165987 has 8 divisors (see below), whose sum is σ = 2317536. Its totient is φ = 2017152.

The previous prime is 2165971. The next prime is 2166007. The reversal of 2165987 is 7895612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2165987 - 2⁴ = 2165971 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2165987.

It is not an unprimeable number, because it can be changed into a prime (2165957) 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, 1133 + ... + 2369.

It is an arithmetic number, because the mean of its divisors is an integer number (289692).

2^2165987 is an apocalyptic number.

2165987 is a deficient number, since it is larger than the sum of its proper divisors (151549).

2165987 is a wasteful number, since it uses less digits than its factorization.

2165987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357.

The product of its digits is 30240, while the sum is 38.

The square root of 2165987 is about 1471.7292549922. The cubic root of 2165987 is about 129.3854027124.

The spelling of 2165987 in words is "two million, one hundred sixty-five thousand, nine hundred eighty-seven".