180000018 has 24 divisors (see below), whose sum is σ = 425455056. Its totient is φ = 54545400.

The previous prime is 180000017. The next prime is 180000049. The reversal of 180000018 is 810000081.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (180000017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 454348 + ... + 454743.

It is an arithmetic number, because the mean of its divisors is an integer number (17727294).

Almost surely, 2^180000018 is an apocalyptic number.

180000018 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

180000018 is an abundant number, since it is smaller than the sum of its proper divisors (245455038).

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

180000018 is a wasteful number, since it uses less digits than its factorization.

180000018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909110 (or 909107 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 180000018 is about 13416.4085358191. The cubic root of 180000018 is about 564.6216361493.

180000018 divided by its sum of digits (18) gives a palindrome (10000001).

Adding to 180000018 its reverse (810000081), we get a palindrome (990000099).

The spelling of 180000018 in words is "one hundred eighty million, eighteen", and thus it is an aban number.