11808018 has 20 divisors (see below), whose sum is σ = 26459070. Its totient is φ = 3935952.

The previous prime is 11808007. The next prime is 11808019. The reversal of 11808018 is 81080811.

It can be written as a sum of positive squares in only one way, i.e., 7634169 + 4173849 = 2763^2 + 2043^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11807982 and 11808000.

It is not an unprimeable number, because it can be changed into a prime (11808019) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 36283 + ... + 36606.

Almost surely, 2^11808018 is an apocalyptic number.

11808018 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

11808018 is an abundant number, since it is smaller than the sum of its proper divisors (14651052).

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

11808018 is an equidigital number, since it uses as much as digits as its factorization.

11808018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72903 (or 72894 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 27.

The square root of 11808018 is about 3436.2796742989. The cubic root of 11808018 is about 227.7153650315.

Adding to 11808018 its reverse (81080811), we get a palindrome (92888829).

The spelling of 11808018 in words is "eleven million, eight hundred eight thousand, eighteen".