2850809 has 4 divisors (see below), whose sum is σ = 3070116. Its totient is φ = 2631504.

The previous prime is 2850797. The next prime is 2850811. The reversal of 2850809 is 9080582.

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 739600 + 2111209 = 860^2 + 1453^2 .

It is a cyclic number.

It is not a de Polignac number, because 2850809 - 2¹⁶ = 2785273 is a prime.

It is a super-2 number, since 2×2850809² = 16254223908962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2850829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109634 + ... + 109659.

It is an arithmetic number, because the mean of its divisors is an integer number (767529).

2^2850809 is an apocalyptic number.

It is an amenable number.

2850809 is a deficient number, since it is larger than the sum of its proper divisors (219307).

2850809 is a wasteful number, since it uses less digits than its factorization.

2850809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219306.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 2850809 is about 1688.4338897333. The cubic root of 2850809 is about 141.7934078391.

The spelling of 2850809 in words is "two million, eight hundred fifty thousand, eight hundred nine".