1000818 has 72 divisors (see below), whose sum is σ = 2740608. Its totient is φ = 258336.

The previous prime is 1000793. The next prime is 1000829. The reversal of 1000818 is 8180001.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 1000818.

It is a congruent number.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 21271 + ... + 21317.

It is an arithmetic number, because the mean of its divisors is an integer number (38064).

2^1000818 is an apocalyptic number.

1000818 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 1000818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1370304).

1000818 is an abundant number, since it is smaller than the sum of its proper divisors (1739790).

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

1000818 is a wasteful number, since it uses less digits than its factorization.

1000818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88 (or 72 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 1000818 is about 1000.4089163937. The cubic root of 1000818 is about 100.0272592353.

Adding to 1000818 its reverse (8180001), we get a palindrome (9180819).

The spelling of 1000818 in words is "one million, eight hundred eighteen", and thus it is an aban number.