2644855 has 4 divisors (see below), whose sum is σ = 3173832. Its totient is φ = 2115880.

The previous prime is 2644853. The next prime is 2644879. The reversal of 2644855 is 5584462.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2644855 - 2¹ = 2644853 is a prime.

It is a Duffinian number.

2644855 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2644855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2644853) 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 3 ways as a sum of consecutive naturals, for example, 264481 + ... + 264490.

It is an arithmetic number, because the mean of its divisors is an integer number (793458).

2^2644855 is an apocalyptic number.

2644855 is a deficient number, since it is larger than the sum of its proper divisors (528977).

2644855 is an equidigital number, since it uses as much as digits as its factorization.

2644855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528976.

The product of its digits is 38400, while the sum is 34.

The square root of 2644855 is about 1626.3010176471. The cubic root of 2644855 is about 138.2931352047.

The spelling of 2644855 in words is "two million, six hundred forty-four thousand, eight hundred fifty-five".