1009818 has 12 divisors (see below), whose sum is σ = 2187978. Its totient is φ = 336600.

The previous prime is 1009807. The next prime is 1009819. The reversal of 1009818 is 8189001.

It can be written as a sum of positive squares in only one way, i.e., 804609 + 205209 = 897^2 + 453^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1009791 and 1009800.

It is not an unprimeable number, because it can be changed into a prime (1009819) 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 5 ways as a sum of consecutive naturals, for example, 28033 + ... + 28068.

2^1009818 is an apocalyptic number.

1009818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1009818 is an abundant number, since it is smaller than the sum of its proper divisors (1178160).

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

1009818 is a wasteful number, since it uses less digits than its factorization.

1009818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56109 (or 56106 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The square root of 1009818 is about 1004.8970096483. The cubic root of 1009818 is about 100.3262014359.

The spelling of 1009818 in words is "one million, nine thousand, eight hundred eighteen".