18186122 has 4 divisors (see below), whose sum is σ = 27279186. Its totient is φ = 9093060.

The previous prime is 18186121. The next prime is 18186127. The reversal of 18186122 is 22168181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22168181 = 7 ⋅3166883.

It can be written as a sum of positive squares in only one way, i.e., 17547721 + 638401 = 4189^2 + 799^2 .

It is not an unprimeable number, because it can be changed into a prime (18186121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4546529 + ... + 4546532.

Almost surely, 2^18186122 is an apocalyptic number.

18186122 is a deficient number, since it is larger than the sum of its proper divisors (9093064).

18186122 is an equidigital number, since it uses as much as digits as its factorization.

18186122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9093063.

The product of its digits is 1536, while the sum is 29.

The square root of 18186122 is about 4264.5189646665. The cubic root of 18186122 is about 262.9743357108.

The spelling of 18186122 in words is "eighteen million, one hundred eighty-six thousand, one hundred twenty-two".