18266818 has 4 divisors (see below), whose sum is σ = 27400230. Its totient is φ = 9133408.

The previous prime is 18266797. The next prime is 18266827. The reversal of 18266818 is 81866281.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12131289 + 6135529 = 3483^2 + 2477^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4566703 + ... + 4566706.

Almost surely, 2^18266818 is an apocalyptic number.

18266818 is a deficient number, since it is larger than the sum of its proper divisors (9133412).

18266818 is an equidigital number, since it uses as much as digits as its factorization.

18266818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9133411.

The product of its digits is 36864, while the sum is 40.

The square root of 18266818 is about 4273.9698173946. The cubic root of 18266818 is about 263.3627209988.

The spelling of 18266818 in words is "eighteen million, two hundred sixty-six thousand, eight hundred eighteen".