1806885 has 12 divisors (see below), whose sum is σ = 3132012. Its totient is φ = 963648.

The previous prime is 1806877. The next prime is 1806887. The reversal of 1806885 is 5886081.

It can be written as a sum of positive squares in 2 ways, for example, as 820836 + 986049 = 906^2 + 993^2 .

It is not a de Polignac number, because 1806885 - 2³ = 1806877 is a prime.

1806885 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1806887) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20032 + ... + 20121.

It is an arithmetic number, because the mean of its divisors is an integer number (261001).

2^1806885 is an apocalyptic number.

1806885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1806885 is a deficient number, since it is larger than the sum of its proper divisors (1325127).

1806885 is a wasteful number, since it uses less digits than its factorization.

1806885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40164 (or 40161 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The square root of 1806885 is about 1344.2042255550. The cubic root of 1806885 is about 121.7989387339.

The spelling of 1806885 in words is "one million, eight hundred six thousand, eight hundred eighty-five".