2165755 has 4 divisors (see below), whose sum is σ = 2598912. Its totient is φ = 1732600.

The previous prime is 2165747. The next prime is 2165771. The reversal of 2165755 is 5575612.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2165755 - 2³ = 2165747 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216571 + ... + 216580.

It is an arithmetic number, because the mean of its divisors is an integer number (649728).

2^2165755 is an apocalyptic number.

2165755 is a deficient number, since it is larger than the sum of its proper divisors (433157).

2165755 is an equidigital number, since it uses as much as digits as its factorization.

2165755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433156.

The product of its digits is 10500, while the sum is 31.

The square root of 2165755 is about 1471.6504340366. The cubic root of 2165755 is about 129.3807830348.

It can be divided in two parts, 21657 and 55, that added together give a palindrome (21712).

The spelling of 2165755 in words is "two million, one hundred sixty-five thousand, seven hundred fifty-five".