18224155 has 4 divisors (see below), whose sum is σ = 21868992. Its totient is φ = 14579320.

The previous prime is 18224149. The next prime is 18224161. The reversal of 18224155 is 55142281.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (18224149) and next prime (18224161).

It is not a de Polignac number, because 18224155 - 2¹³ = 18215963 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1822411 + ... + 1822420.

It is an arithmetic number, because the mean of its divisors is an integer number (5467248).

Almost surely, 2^18224155 is an apocalyptic number.

18224155 is a deficient number, since it is larger than the sum of its proper divisors (3644837).

18224155 is an equidigital number, since it uses as much as digits as its factorization.

18224155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3644836.

The product of its digits is 3200, while the sum is 28.

The square root of 18224155 is about 4268.9758725015. The cubic root of 18224155 is about 263.1575292241.

The spelling of 18224155 in words is "eighteen million, two hundred twenty-four thousand, one hundred fifty-five".