2165505 has 16 divisors (see below), whose sum is σ = 3577344. Its totient is φ = 1117440.

The previous prime is 2165483. The next prime is 2165521. The reversal of 2165505 is 5055612.

It is not a de Polignac number, because 2165505 - 2⁸ = 2165249 is a prime.

2165505 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1864 + ... + 2793.

It is an arithmetic number, because the mean of its divisors is an integer number (223584).

2^2165505 is an apocalyptic number.

It is an amenable number.

2165505 is a deficient number, since it is larger than the sum of its proper divisors (1411839).

2165505 is a wasteful number, since it uses less digits than its factorization.

2165505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4696.

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 2165505 is about 1471.5654929360. The cubic root of 2165505 is about 129.3758045645.

The spelling of 2165505 in words is "two million, one hundred sixty-five thousand, five hundred five".