18253918 has 4 divisors (see below), whose sum is σ = 27380880. Its totient is φ = 9126958.

The previous prime is 18253909. The next prime is 18253931. The reversal of 18253918 is 81935281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81935281 = 179 ⋅457739.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4563478 + ... + 4563481.

It is an arithmetic number, because the mean of its divisors is an integer number (6845220).

Almost surely, 2^18253918 is an apocalyptic number.

18253918 is a deficient number, since it is larger than the sum of its proper divisors (9126962).

18253918 is an equidigital number, since it uses as much as digits as its factorization.

18253918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9126961.

The product of its digits is 17280, while the sum is 37.

The square root of 18253918 is about 4272.4604152643. The cubic root of 18253918 is about 263.3007109440.

The spelling of 18253918 in words is "eighteen million, two hundred fifty-three thousand, nine hundred eighteen".