1806745 has 4 divisors (see below), whose sum is σ = 2168100. Its totient is φ = 1445392.

The previous prime is 1806733. The next prime is 1806769. The reversal of 1806745 is 5476081.

1806745 is an esthetic number in base 4, because in such base its adjacent digits differ by 1.

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 534361 + 1272384 = 731^2 + 1128^2 .

It is a cyclic number.

It is not a de Polignac number, because 1806745 - 2⁵ = 1806713 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 3 ways as a sum of consecutive naturals, for example, 180670 + ... + 180679.

It is an arithmetic number, because the mean of its divisors is an integer number (542025).

2^1806745 is an apocalyptic number.

It is an amenable number.

1806745 is a deficient number, since it is larger than the sum of its proper divisors (361355).

1806745 is an equidigital number, since it uses as much as digits as its factorization.

1806745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361354.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 1806745 is about 1344.1521491260. The cubic root of 1806745 is about 121.7957929348.

The spelling of 1806745 in words is "one million, eight hundred six thousand, seven hundred forty-five".