2643844 has 48 divisors (see below), whose sum is σ = 5644800. Its totient is φ = 1081920.

The previous prime is 2643833. The next prime is 2643853. The reversal of 2643844 is 4483462.

It is a super-2 number, since 2×2643844² = 13979822192672, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56229 + ... + 56275.

It is an arithmetic number, because the mean of its divisors is an integer number (117600).

2^2643844 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2643844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2822400).

2643844 is an abundant number, since it is smaller than the sum of its proper divisors (3000956).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2643844 is a wasteful number, since it uses less digits than its factorization.

2643844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113 (or 97 counting only the distinct ones).

The product of its digits is 18432, while the sum is 31.

The square root of 2643844 is about 1625.9901598718. The cubic root of 2643844 is about 138.2755120359.

The spelling of 2643844 in words is "two million, six hundred forty-three thousand, eight hundred forty-four".