18443424 has 48 divisors (see below), whose sum is σ = 50524992. Its totient is φ = 5879808.

The previous prime is 18443423. The next prime is 18443441. The reversal of 18443424 is 42434481.

It is a tau number, because it is divible by the number of its divisors (48).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 18443391 and 18443400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18443423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1969 + ... + 6384.

It is an arithmetic number, because the mean of its divisors is an integer number (1052604).

Almost surely, 2^18443424 is an apocalyptic number.

It is an amenable number.

18443424 is an abundant number, since it is smaller than the sum of its proper divisors (32081568).

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

18443424 is a wasteful number, since it uses less digits than its factorization.

18443424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8389 (or 8381 counting only the distinct ones).

The product of its digits is 12288, while the sum is 30.

The square root of 18443424 is about 4294.5807711580. The cubic root of 18443424 is about 264.2087421605.

The spelling of 18443424 in words is "eighteen million, four hundred forty-three thousand, four hundred twenty-four".