2820605 has 8 divisors (see below), whose sum is σ = 3532032. Its totient is φ = 2158288.

The previous prime is 2820563. The next prime is 2820619. The reversal of 2820605 is 5060282.

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 2820605 - 2⁶ = 2820541 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 12149 + ... + 12378.

It is an arithmetic number, because the mean of its divisors is an integer number (441504).

2^2820605 is an apocalyptic number.

It is an amenable number.

2820605 is a deficient number, since it is larger than the sum of its proper divisors (711427).

2820605 is a wasteful number, since it uses less digits than its factorization.

2820605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24555.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 2820605 is about 1679.4656888427. The cubic root of 2820605 is about 141.2908671266.

Adding to 2820605 its reverse (5060282), we get a palindrome (7880887).

The spelling of 2820605 in words is "two million, eight hundred twenty thousand, six hundred five".