18130818 has 16 divisors (see below), whose sum is σ = 36876960. Its totient is φ = 5941056.

The previous prime is 18130817. The next prime is 18130867. The reversal of 18130818 is 81803181.

It is a super-2 number, since 2×18130818² = 657453122698248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18130811) 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, 25255 + ... + 25962.

It is an arithmetic number, because the mean of its divisors is an integer number (2304810).

Almost surely, 2^18130818 is an apocalyptic number.

18130818 is an abundant number, since it is smaller than the sum of its proper divisors (18746142).

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

18130818 is a wasteful number, since it uses less digits than its factorization.

18130818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51281.

The product of its (nonzero) digits is 1536, while the sum is 30.

The square root of 18130818 is about 4258.0298261050. The cubic root of 18130818 is about 262.7074967092.

Adding to 18130818 its reverse (81803181), we get a palindrome (99933999).

The spelling of 18130818 in words is "eighteen million, one hundred thirty thousand, eight hundred eighteen".