2856005 has 4 divisors (see below), whose sum is σ = 3427212. Its totient is φ = 2284800.

The previous prime is 2856001. The next prime is 2856037. The reversal of 2856005 is 5006582.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1674436 + 1181569 = 1294^2 + 1087^2 .

It is not a de Polignac number, because 2856005 - 2² = 2856001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2856001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 285596 + ... + 285605.

It is an arithmetic number, because the mean of its divisors is an integer number (856803).

2^2856005 is an apocalyptic number.

It is an amenable number.

2856005 is a deficient number, since it is larger than the sum of its proper divisors (571207).

2856005 is an equidigital number, since it uses as much as digits as its factorization.

2856005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571206.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 2856005 is about 1689.9718932574. The cubic root of 2856005 is about 141.8795016911.

The spelling of 2856005 in words is "two million, eight hundred fifty-six thousand, five".