18224943 has 8 divisors (see below), whose sum is σ = 26509056. Its totient is φ = 11045400.

The previous prime is 18224939. The next prime is 18224953. The reversal of 18224943 is 34942281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18224943 - 2² = 18224939 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 552271 = 18224943 / (1 + 8 + 2 + 2 + 4 + 9 + 4 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18224953) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 276103 + ... + 276168.

It is an arithmetic number, because the mean of its divisors is an integer number (3313632).

Almost surely, 2^18224943 is an apocalyptic number.

18224943 is a deficient number, since it is larger than the sum of its proper divisors (8284113).

18224943 is a wasteful number, since it uses less digits than its factorization.

18224943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552285.

The product of its digits is 13824, while the sum is 33.

The square root of 18224943 is about 4269.0681653026. The cubic root of 18224943 is about 263.1613220866.

The spelling of 18224943 in words is "eighteen million, two hundred twenty-four thousand, nine hundred forty-three".