18718544 has 40 divisors (see below), whose sum is σ = 40330752. Its totient is φ = 8357760.

The previous prime is 18718541. The next prime is 18718561. The reversal of 18718544 is 44581781.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18718498 and 18718507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18718541) 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, 4997 + ... + 7899.

Almost surely, 2^18718544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18718544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20165376).

18718544 is an abundant number, since it is smaller than the sum of its proper divisors (21612208).

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

18718544 is a wasteful number, since it uses less digits than its factorization.

18718544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2955 (or 2949 counting only the distinct ones).

The product of its digits is 35840, while the sum is 38.

The square root of 18718544 is about 4326.4932682254. The cubic root of 18718544 is about 265.5159947474.

The spelling of 18718544 in words is "eighteen million, seven hundred eighteen thousand, five hundred forty-four".