18224147 has 4 divisors (see below), whose sum is σ = 18239496. Its totient is φ = 18208800.

The previous prime is 18224117. The next prime is 18224149. The reversal of 18224147 is 74142281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74142281 = 3037 ⋅24413.

It is a cyclic number.

It is not a de Polignac number, because 18224147 - 2¹² = 18220051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18224149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5729 + ... + 8322.

It is an arithmetic number, because the mean of its divisors is an integer number (4559874).

Almost surely, 2^18224147 is an apocalyptic number.

18224147 is a deficient number, since it is larger than the sum of its proper divisors (15349).

18224147 is a wasteful number, since it uses less digits than its factorization.

18224147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15348.

The product of its digits is 3584, while the sum is 29.

The square root of 18224147 is about 4268.9749355085. The cubic root of 18224147 is about 263.1574907173.

The spelling of 18224147 in words is "eighteen million, two hundred twenty-four thousand, one hundred forty-seven".