2775805 has 16 divisors (see below), whose sum is σ = 3571200. Its totient is φ = 2064960.

The previous prime is 2775781. The next prime is 2775841. The reversal of 2775805 is 5085772.

It is not a de Polignac number, because 2775805 - 2⁹ = 2775293 is a prime.

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, 5556 + ... + 6034.

It is an arithmetic number, because the mean of its divisors is an integer number (223200).

2^2775805 is an apocalyptic number.

It is an amenable number.

2775805 is a deficient number, since it is larger than the sum of its proper divisors (795395).

2775805 is a wasteful number, since it uses less digits than its factorization.

2775805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564.

The product of its (nonzero) digits is 19600, while the sum is 34.

The square root of 2775805 is about 1666.0747282160. The cubic root of 2775805 is about 140.5388248981.

The spelling of 2775805 in words is "two million, seven hundred seventy-five thousand, eight hundred five".