2890809 has 20 divisors (see below), whose sum is σ = 4377780. Its totient is φ = 1900800.

The previous prime is 2890763. The next prime is 2890813. The reversal of 2890809 is 9080982.

It can be written as a sum of positive squares in 2 ways, for example, as 1946025 + 944784 = 1395^2 + 972^2 .

It is not a de Polignac number, because 2890809 - 2¹⁵ = 2858041 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2890889) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7009 + ... + 7409.

It is an arithmetic number, because the mean of its divisors is an integer number (218889).

2^2890809 is an apocalyptic number.

It is an amenable number.

2890809 is a deficient number, since it is larger than the sum of its proper divisors (1486971).

2890809 is an equidigital number, since it uses as much as digits as its factorization.

2890809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502 (or 493 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 2890809 is about 1700.2379245270. The cubic root of 2890809 is about 142.4535028354.

The spelling of 2890809 in words is "two million, eight hundred ninety thousand, eight hundred nine".