1644073 has 2 divisors, whose sum is σ = 1644074. Its totient is φ = 1644072.

The previous prime is 1644067. The next prime is 1644079. The reversal of 1644073 is 3704461.

It is a balanced prime because it is at equal distance from previous prime (1644067) and next prime (1644079).

It can be written as a sum of positive squares in only one way, i.e., 1327104 + 316969 = 1152^2 + 563^2 .

It is an emirp because it is prime and its reverse (3704461) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1644073 is a prime.

It is a super-3 number, since 3×1644073³ = 13331669728401051051, which contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1644079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822036 + 822037.

It is an arithmetic number, because the mean of its divisors is an integer number (822037).

2^1644073 is an apocalyptic number.

It is an amenable number.

1644073 is a deficient number, since it is larger than the sum of its proper divisors (1).

1644073 is an equidigital number, since it uses as much as digits as its factorization.

1644073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 1644073 is about 1282.2141006868. The cubic root of 1644073 is about 118.0249157384.

Adding to 1644073 its product of nonzero digits (2016), we get a square (1646089 = 1283²).

The spelling of 1644073 in words is "one million, six hundred forty-four thousand, seventy-three".