2805999 has 16 divisors (see below), whose sum is σ = 4381440. Its totient is φ = 1563840.

The previous prime is 2805989. The next prime is 2806007. The reversal of 2805999 is 9995082.

It is not a de Polignac number, because 2805999 - 2⁵ = 2805967 is a prime.

2805999 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2805999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2805949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 769 + ... + 2490.

It is an arithmetic number, because the mean of its divisors is an integer number (273840).

2^2805999 is an apocalyptic number.

2805999 is a deficient number, since it is larger than the sum of its proper divisors (1575441).

2805999 is a wasteful number, since it uses less digits than its factorization.

2805999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3310.

The product of its (nonzero) digits is 58320, while the sum is 42.

The square root of 2805999 is about 1675.1116380707. Note that the first 3 decimals coincide. The cubic root of 2805999 is about 141.0465617564.

The spelling of 2805999 in words is "two million, eight hundred five thousand, nine hundred ninety-nine".