1813818 has 16 divisors (see below), whose sum is σ = 3640896. Its totient is φ = 602400.

The previous prime is 1813817. The next prime is 1813829. The reversal of 1813818 is 8183181.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1813813) 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 7 ways as a sum of consecutive naturals, for example, 2718 + ... + 3318.

It is an arithmetic number, because the mean of its divisors is an integer number (227556).

2^1813818 is an apocalyptic number.

1813818 is an abundant number, since it is smaller than the sum of its proper divisors (1827078).

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

1813818 is a wasteful number, since it uses less digits than its factorization.

1813818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109.

The product of its digits is 1536, while the sum is 30.

The square root of 1813818 is about 1346.7806057410. The cubic root of 1813818 is about 121.9545203588.

Adding to 1813818 its reverse (8183181), we get a palindrome (9996999).

The spelling of 1813818 in words is "one million, eight hundred thirteen thousand, eight hundred eighteen".