18700018 has 8 divisors (see below), whose sum is σ = 28734300. Its totient is φ = 9121920.

The previous prime is 18700013. The next prime is 18700027. The reversal of 18700018 is 81000781.

It can be written as a sum of positive squares in 2 ways, for example, as 18550249 + 149769 = 4307^2 + 387^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 18699965 and 18700001.

It is not an unprimeable number, because it can be changed into a prime (18700013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113943 + ... + 114106.

Almost surely, 2^18700018 is an apocalyptic number.

18700018 is a deficient number, since it is larger than the sum of its proper divisors (10034282).

18700018 is a wasteful number, since it uses less digits than its factorization.

18700018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228092.

The product of its (nonzero) digits is 448, while the sum is 25.

The square root of 18700018 is about 4324.3517433252. The cubic root of 18700018 is about 265.4283708917.

Adding to 18700018 its reverse (81000781), we get a palindrome (99700799).

The spelling of 18700018 in words is "eighteen million, seven hundred thousand, eighteen".