2153665 has 8 divisors (see below), whose sum is σ = 2592360. Its totient is φ = 1717632.

The previous prime is 2153647. The next prime is 2153693. The reversal of 2153665 is 5663512.

It can be written as a sum of positive squares in 4 ways, for example, as 82944 + 2070721 = 288^2 + 1439^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2153665 - 2⁵ = 2153633 is a prime.

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, 2467 + ... + 3223.

It is an arithmetic number, because the mean of its divisors is an integer number (324045).

2^2153665 is an apocalyptic number.

It is an amenable number.

2153665 is a deficient number, since it is larger than the sum of its proper divisors (438695).

2153665 is an equidigital number, since it uses as much as digits as its factorization.

2153665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331.

The product of its digits is 5400, while the sum is 28.

The square root of 2153665 is about 1467.5370523431. The cubic root of 2153665 is about 129.1395841011.

The spelling of 2153665 in words is "two million, one hundred fifty-three thousand, six hundred sixty-five".