18439224 has 16 divisors (see below), whose sum is σ = 46098120. Its totient is φ = 6146400.

The previous prime is 18439219. The next prime is 18439229. The reversal of 18439224 is 42293481.

It is an interprime number because it is at equal distance from previous prime (18439219) and next prime (18439229).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18439229) by changing a digit.

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, 384127 + ... + 384174.

Almost surely, 2^18439224 is an apocalyptic number.

It is an amenable number.

18439224 is an abundant number, since it is smaller than the sum of its proper divisors (27658896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18439224 is a wasteful number, since it uses less digits than its factorization.

18439224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768310 (or 768306 counting only the distinct ones).

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

The square root of 18439224 is about 4294.0917549582. The cubic root of 18439224 is about 264.1886851299.

The spelling of 18439224 in words is "eighteen million, four hundred thirty-nine thousand, two hundred twenty-four".