18018499 has 4 divisors (see below), whose sum is σ = 18801936. Its totient is φ = 17235064.

The previous prime is 18018491. The next prime is 18018503. The reversal of 18018499 is 99481081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99481081 = 7 ⋅14211583.

It is a cyclic number.

It is not a de Polignac number, because 18018499 - 2³ = 18018491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18018491) 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 3 ways as a sum of consecutive naturals, for example, 391684 + ... + 391729.

It is an arithmetic number, because the mean of its divisors is an integer number (4700484).

Almost surely, 2^18018499 is an apocalyptic number.

18018499 is a deficient number, since it is larger than the sum of its proper divisors (783437).

18018499 is an equidigital number, since it uses as much as digits as its factorization.

18018499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783436.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 18018499 is about 4244.8202553230. The cubic root of 18018499 is about 262.1638884879.

The spelling of 18018499 in words is "eighteen million, eighteen thousand, four hundred ninety-nine".