18123355 has 4 divisors (see below), whose sum is σ = 21748032. Its totient is φ = 14498680.

The previous prime is 18123331. The next prime is 18123361. The reversal of 18123355 is 55332181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55332181 = 23 ⋅2405747.

It is not a de Polignac number, because 18123355 - 2⁵ = 18123323 is a prime.

It is a Duffinian 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 in 3 ways as a sum of consecutive naturals, for example, 1812331 + ... + 1812340.

It is an arithmetic number, because the mean of its divisors is an integer number (5437008).

Almost surely, 2^18123355 is an apocalyptic number.

18123355 is a deficient number, since it is larger than the sum of its proper divisors (3624677).

18123355 is an equidigital number, since it uses as much as digits as its factorization.

18123355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3624676.

The product of its digits is 3600, while the sum is 28.

The square root of 18123355 is about 4257.1533916456. The cubic root of 18123355 is about 262.6714465777.

The spelling of 18123355 in words is "eighteen million, one hundred twenty-three thousand, three hundred fifty-five".