2609805 has 16 divisors (see below), whose sum is σ = 4555584. Its totient is φ = 1265280.

The previous prime is 2609791. The next prime is 2609809. The reversal of 2609805 is 5089062.

It is not a de Polignac number, because 2609805 - 2¹⁴ = 2593421 is a prime.

It is a super-2 number, since 2×2609805² = 13622164276050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2609809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7744 + ... + 8073.

It is an arithmetic number, because the mean of its divisors is an integer number (284724).

2^2609805 is an apocalyptic number.

It is an amenable number.

2609805 is a deficient number, since it is larger than the sum of its proper divisors (1945779).

2609805 is a wasteful number, since it uses less digits than its factorization.

2609805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15836.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 2609805 is about 1615.4890900282. The cubic root of 2609805 is about 137.6795230844.

The spelling of 2609805 in words is "two million, six hundred nine thousand, eight hundred five".