18230518 has 4 divisors (see below), whose sum is σ = 27345780. Its totient is φ = 9115258.

The previous prime is 18230507. The next prime is 18230543. The reversal of 18230518 is 81503281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81503281 = 307 ⋅265483.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 4557628 + ... + 4557631.

It is an arithmetic number, because the mean of its divisors is an integer number (6836445).

Almost surely, 2^18230518 is an apocalyptic number.

18230518 is a deficient number, since it is larger than the sum of its proper divisors (9115262).

18230518 is an equidigital number, since it uses as much as digits as its factorization.

18230518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9115261.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 18230518 is about 4269.7210681730. The cubic root of 18230518 is about 263.1881529853.

Adding to 18230518 its reverse (81503281), we get a palindrome (99733799).

The spelling of 18230518 in words is "eighteen million, two hundred thirty thousand, five hundred eighteen".