2605813 has 8 divisors (see below), whose sum is σ = 2995200. Its totient is φ = 2220720.

The previous prime is 2605787. The next prime is 2605819. The reversal of 2605813 is 3185062.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2605813 - 2⁵ = 2605781 is a prime.

It is a super-2 number, since 2×2605813² = 13580522781938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2605819) 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 7 ways as a sum of consecutive naturals, for example, 363 + ... + 2311.

It is an arithmetic number, because the mean of its divisors is an integer number (374400).

2^2605813 is an apocalyptic number.

It is an amenable number.

2605813 is a deficient number, since it is larger than the sum of its proper divisors (389387).

2605813 is a wasteful number, since it uses less digits than its factorization.

2605813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2147.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 2605813 is about 1614.2530780519. The cubic root of 2605813 is about 137.6092883186.

The spelling of 2605813 in words is "two million, six hundred five thousand, eight hundred thirteen".