1118209 has 4 divisors (see below), whose sum is σ = 1184004. Its totient is φ = 1052416.

The previous prime is 1118203. The next prime is 1118219. The reversal of 1118209 is 9028111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9028111 = 37 ⋅244003.

It can be written as a sum of positive squares in 2 ways, for example, as 804609 + 313600 = 897^2 + 560^2 .

It is a cyclic number.

It is not a de Polignac number, because 1118209 - 2⁷ = 1118081 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1118209.

It is not an unprimeable number, because it can be changed into a prime (1118203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32872 + ... + 32905.

It is an arithmetic number, because the mean of its divisors is an integer number (296001).

It is a Proth number, since it is equal to 273 ⋅ 2¹² + 1 and 273 < 2¹².

2^1118209 is an apocalyptic number.

It is an amenable number.

1118209 is a deficient number, since it is larger than the sum of its proper divisors (65795).

1118209 is an equidigital number, since it uses as much as digits as its factorization.

1118209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65794.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 1118209 is about 1057.4540179128. The cubic root of 1118209 is about 103.7944968082.

The spelling of 1118209 in words is "one million, one hundred eighteen thousand, two hundred nine".