1118999 has 4 divisors (see below), whose sum is σ = 1278864. Its totient is φ = 959136.

The previous prime is 1118993. The next prime is 1119029. The reversal of 1118999 is 9998111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9998111 = 347 ⋅28813.

It is a cyclic number.

It is not a de Polignac number, because 1118999 - 2²⁰ = 70423 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1118993) 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, 79922 + ... + 79935.

It is an arithmetic number, because the mean of its divisors is an integer number (319716).

2^1118999 is an apocalyptic number.

1118999 is a deficient number, since it is larger than the sum of its proper divisors (159865).

1118999 is an equidigital number, since it uses as much as digits as its factorization.

1118999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159864.

The product of its digits is 5832, while the sum is 38.

The square root of 1118999 is about 1057.8274906619. The cubic root of 1118999 is about 103.8189342046.

The spelling of 1118999 in words is "one million, one hundred eighteen thousand, nine hundred ninety-nine".