1820808 has 96 divisors (see below), whose sum is σ = 5709600. Its totient is φ = 522720.

The previous prime is 1820783. The next prime is 1820809. The reversal of 1820808 is 8080281.

It is not an unprimeable number, because it can be changed into a prime (1820809) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 95823 + ... + 95841.

It is an arithmetic number, because the mean of its divisors is an integer number (59475).

2^1820808 is an apocalyptic number.

1820808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1820808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2854800).

1820808 is an abundant number, since it is smaller than the sum of its proper divisors (3888792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1820808 is a wasteful number, since it uses less digits than its factorization.

1820808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64 (or 35 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 27.

The square root of 1820808 is about 1349.3731878172. The cubic root of 1820808 is about 122.1109802641.

It can be divided in two parts, 1820 and 808, that added together give a triangular number (2628 = T₇₂).

The spelling of 1820808 in words is "one million, eight hundred twenty thousand, eight hundred eight".