18238716 has 48 divisors (see below), whose sum is σ = 47800480. Its totient is φ = 6013440.

The previous prime is 18238711. The next prime is 18238771. The reversal of 18238716 is 61783281.

It is a super-2 number, since 2×18238716² = 665301522657312, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18238711) 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 15 ways as a sum of consecutive naturals, for example, 9606 + ... + 11346.

Almost surely, 2^18238716 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 18238716, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23900240).

18238716 is an abundant number, since it is smaller than the sum of its proper divisors (29561764).

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

18238716 is a wasteful number, since it uses less digits than its factorization.

18238716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1851 (or 1843 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 18238716 is about 4270.6809761442. The cubic root of 18238716 is about 263.2275977073.

It can be divided in two parts, 182387 and 16, that multiplied together give a palindrome (2918192).

The spelling of 18238716 in words is "eighteen million, two hundred thirty-eight thousand, seven hundred sixteen".