1806445 has 8 divisors (see below), whose sum is σ = 2214144. Its totient is φ = 1414224.

The previous prime is 1806421. The next prime is 1806461. The reversal of 1806445 is 5446081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1806445 - 2¹³ = 1798253 is a prime.

It is a Duffinian number.

1806445 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3609 + ... + 4078.

It is an arithmetic number, because the mean of its divisors is an integer number (276768).

2^1806445 is an apocalyptic number.

It is an amenable number.

1806445 is a deficient number, since it is larger than the sum of its proper divisors (407699).

1806445 is an equidigital number, since it uses as much as digits as its factorization.

1806445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7739.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 1806445 is about 1344.0405499835. The cubic root of 1806445 is about 121.7890513894.

The spelling of 1806445 in words is "one million, eight hundred six thousand, four hundred forty-five".