2172665 has 8 divisors (see below), whose sum is σ = 2844288. Its totient is φ = 1580080.

The previous prime is 2172659. The next prime is 2172673. The reversal of 2172665 is 5662712.

2172665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a de Polignac number, because none of the positive numbers 2^k-2172665 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19697 + ... + 19806.

It is an arithmetic number, because the mean of its divisors is an integer number (355536).

2^2172665 is an apocalyptic number.

It is an amenable number.

2172665 is a deficient number, since it is larger than the sum of its proper divisors (671623).

2172665 is a wasteful number, since it uses less digits than its factorization.

2172665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39519.

The product of its digits is 5040, while the sum is 29.

The square root of 2172665 is about 1473.9962686520. The cubic root of 2172665 is about 129.5182365755.

It can be divided in two parts, 217 and 2665, that added together give a palindrome (2882).

The spelling of 2172665 in words is "two million, one hundred seventy-two thousand, six hundred sixty-five".