1822644 has 36 divisors (see below), whose sum is σ = 4648644. Its totient is φ = 602112.

The previous prime is 1822637. The next prime is 1822649. The reversal of 1822644 is 4462281.

1822644 is a `hidden beast` number, since 18 + 2 + 2 + 644 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1790244 + 32400 = 1338^2 + 180^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1822649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6964 + ... + 7220.

It is an arithmetic number, because the mean of its divisors is an integer number (129129).

2^1822644 is an apocalyptic number.

It is an amenable number.

1822644 is an abundant number, since it is smaller than the sum of its proper divisors (2826000).

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

1822644 is a wasteful number, since it uses less digits than its factorization.

1822644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464 (or 459 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

The square root of 1822644 is about 1350.0533322799. The cubic root of 1822644 is about 122.1520097496.

The spelling of 1822644 in words is "one million, eight hundred twenty-two thousand, six hundred forty-four".