18161118 has 16 divisors (see below), whose sum is σ = 40358160. Its totient is φ = 6053688.

The previous prime is 18161111. The next prime is 18161119. The reversal of 18161118 is 81116181.

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

It is a junction number, because it is equal to n+sod(n) for n = 18161091 and 18161100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18161111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168105 + ... + 168212.

It is an arithmetic number, because the mean of its divisors is an integer number (2522385).

Almost surely, 2^18161118 is an apocalyptic number.

18161118 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18161118 is an abundant number, since it is smaller than the sum of its proper divisors (22197042).

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

18161118 is a wasteful number, since it uses less digits than its factorization.

18161118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336328 (or 336322 counting only the distinct ones).

The product of its digits is 384, while the sum is 27.

The square root of 18161118 is about 4261.5863243633. The cubic root of 18161118 is about 262.8537597739.

Adding to 18161118 its reverse (81116181), we get a palindrome (99277299).

The spelling of 18161118 in words is "eighteen million, one hundred sixty-one thousand, one hundred eighteen".