1808811 has 20 divisors (see below), whose sum is σ = 2738472. Its totient is φ = 1189728.

The previous prime is 1808803. The next prime is 1808813. The reversal of 1808811 is 1188081.

It is not a de Polignac number, because 1808811 - 2³ = 1808803 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1808813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11016 + ... + 11178.

2^1808811 is an apocalyptic number.

1808811 is a deficient number, since it is larger than the sum of its proper divisors (929661).

1808811 is a wasteful number, since it uses less digits than its factorization.

1808811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312 (or 303 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 27.

The square root of 1808811 is about 1344.9204437438. The cubic root of 1808811 is about 121.8421994571.

The spelling of 1808811 in words is "one million, eight hundred eight thousand, eight hundred eleven".