1806805 has 48 divisors (see below), whose sum is σ = 3072384. Its totient is φ = 984960.

The previous prime is 1806803. The next prime is 1806839. The reversal of 1806805 is 5086081.

It is a happy number.

It is not a de Polignac number, because 1806805 - 2¹ = 1806803 is a prime.

It is a super-3 number, since 3×1806805³ = 17695184935383330375, which contains 333 as substring.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1806803) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 95086 + ... + 95104.

It is an arithmetic number, because the mean of its divisors is an integer number (64008).

2^1806805 is an apocalyptic number.

It is an amenable number.

1806805 is a deficient number, since it is larger than the sum of its proper divisors (1265579).

1806805 is a wasteful number, since it uses less digits than its factorization.

1806805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74 (or 55 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 1806805 is about 1344.1744678426. The cubic root of 1806805 is about 121.7971411543.

The spelling of 1806805 in words is "one million, eight hundred six thousand, eight hundred five".