2158765 has 16 divisors (see below), whose sum is σ = 3042432. Its totient is φ = 1439424.

The previous prime is 2158763. The next prime is 2158769. The reversal of 2158765 is 5678512.

It is not a de Polignac number, because 2158765 - 2¹ = 2158763 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 2158765.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2158763) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 462 + ... + 2128.

It is an arithmetic number, because the mean of its divisors is an integer number (190152).

2^2158765 is an apocalyptic number.

It is an amenable number.

2158765 is a deficient number, since it is larger than the sum of its proper divisors (883667).

2158765 is a wasteful number, since it uses less digits than its factorization.

2158765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1716.

The product of its digits is 16800, while the sum is 34.

The square root of 2158765 is about 1469.2736300635. The cubic root of 2158765 is about 129.2414403454.

The spelling of 2158765 in words is "two million, one hundred fifty-eight thousand, seven hundred sixty-five".