18424016 has 40 divisors (see below), whose sum is σ = 38867304. Its totient is φ = 8409600.

The previous prime is 18423967. The next prime is 18424027. The reversal of 18424016 is 61042481.

It can be written as a sum of positive squares in 4 ways, for example, as 7268416 + 11155600 = 2696^2 + 3340^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20570 + ... + 21446.

Almost surely, 2^18424016 is an apocalyptic number.

18424016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18424016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19433652).

18424016 is an abundant number, since it is smaller than the sum of its proper divisors (20443288).

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

18424016 is a wasteful number, since it uses less digits than its factorization.

18424016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999 (or 993 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 18424016 is about 4292.3205844857. The cubic root of 18424016 is about 264.1160340862.

Adding to 18424016 its reverse (61042481), we get a palindrome (79466497).

The spelling of 18424016 in words is "eighteen million, four hundred twenty-four thousand, sixteen".