1812644 has 6 divisors (see below), whose sum is σ = 3172134. Its totient is φ = 906320.

The previous prime is 1812623. The next prime is 1812661. The reversal of 1812644 is 4462181.

It can be written as a sum of positive squares in only one way, i.e., 1350244 + 462400 = 1162^2 + 680^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 226577 + ... + 226584.

It is an arithmetic number, because the mean of its divisors is an integer number (528689).

2^1812644 is an apocalyptic number.

It is an amenable number.

1812644 is a deficient number, since it is larger than the sum of its proper divisors (1359490).

1812644 is a wasteful number, since it uses less digits than its factorization.

1812644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453165 (or 453163 counting only the distinct ones).

The product of its digits is 1536, while the sum is 26.

The square root of 1812644 is about 1346.3446809788. The cubic root of 1812644 is about 121.9282028510.

The spelling of 1812644 in words is "one million, eight hundred twelve thousand, six hundred forty-four".