1819818 has 96 divisors (see below), whose sum is σ = 5346432. Its totient is φ = 432000.

The previous prime is 1819781. The next prime is 1819819. The reversal of 1819818 is 8189181.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1819819) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 17968 + ... + 18068.

It is an arithmetic number, because the mean of its divisors is an integer number (55692).

2^1819818 is an apocalyptic number.

1819818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1819818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2673216).

1819818 is an abundant number, since it is smaller than the sum of its proper divisors (3526614).

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

1819818 is a wasteful number, since it uses less digits than its factorization.

1819818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140 (or 137 counting only the distinct ones).

The product of its digits is 4608, while the sum is 36.

The square root of 1819818 is about 1349.0063009490. The cubic root of 1819818 is about 122.0888450752.

It can be divided in two parts, 181 and 9818, that added together give a palindrome (9999).

The spelling of 1819818 in words is "one million, eight hundred nineteen thousand, eight hundred eighteen".