1806449 has 4 divisors (see below), whose sum is σ = 1814436. Its totient is φ = 1798464.

The previous prime is 1806421. The next prime is 1806461. The reversal of 1806449 is 9446081.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1254400 + 552049 = 1120^2 + 743^2 .

It is a cyclic number.

It is not a de Polignac number, because 1806449 - 2⁸ = 1806193 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1806479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3644 + ... + 4109.

It is an arithmetic number, because the mean of its divisors is an integer number (453609).

2^1806449 is an apocalyptic number.

It is an amenable number.

1806449 is a deficient number, since it is larger than the sum of its proper divisors (7987).

1806449 is an equidigital number, since it uses as much as digits as its factorization.

1806449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7986.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 1806449 is about 1344.0420380330. The cubic root of 1806449 is about 121.7891412815.

The spelling of 1806449 in words is "one million, eight hundred six thousand, four hundred forty-nine".