18147818 has 8 divisors (see below), whose sum is σ = 29315748. Its totient is φ = 8375904.

The previous prime is 18147769. The next prime is 18147839. The reversal of 18147818 is 81874181.

It can be written as a sum of positive squares in 2 ways, for example, as 13053769 + 5094049 = 3613^2 + 2257^2 .

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

It is a super-2 number, since 2×18147818² = 658686596322248, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 348971 + ... + 349022.

Almost surely, 2^18147818 is an apocalyptic number.

18147818 is a deficient number, since it is larger than the sum of its proper divisors (11167930).

18147818 is a wasteful number, since it uses less digits than its factorization.

18147818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698008.

The product of its digits is 14336, while the sum is 38.

The square root of 18147818 is about 4260.0255867776. The cubic root of 18147818 is about 262.7895785425.

The spelling of 18147818 in words is "eighteen million, one hundred forty-seven thousand, eight hundred eighteen".