2153865 has 32 divisors (see below), whose sum is σ = 4006656. Its totient is φ = 967680.

The previous prime is 2153861. The next prime is 2153873. The reversal of 2153865 is 5683512.

It is not a de Polignac number, because 2153865 - 2² = 2153861 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2153861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7525 + ... + 7805.

It is an arithmetic number, because the mean of its divisors is an integer number (125208).

2^2153865 is an apocalyptic number.

It is an amenable number.

2153865 is a deficient number, since it is larger than the sum of its proper divisors (1852791).

2153865 is a wasteful number, since it uses less digits than its factorization.

2153865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369.

The product of its digits is 7200, while the sum is 30.

The square root of 2153865 is about 1467.6051921413. The cubic root of 2153865 is about 129.1435814912.

The spelling of 2153865 in words is "two million, one hundred fifty-three thousand, eight hundred sixty-five".