18038196 has 108 divisors (see below), whose sum is σ = 51849252. Its totient is φ = 5280000.

The previous prime is 18038159. The next prime is 18038197. The reversal of 18038196 is 69183081.

It can be written as a sum of positive squares in 2 ways, for example, as 9217296 + 8820900 = 3036^2 + 2970^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 18038196.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18038197) 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 35 ways as a sum of consecutive naturals, for example, 178546 + ... + 178646.

Almost surely, 2^18038196 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 18038196, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25924626).

18038196 is an abundant number, since it is smaller than the sum of its proper divisors (33811056).

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

18038196 is a wasteful number, since it uses less digits than its factorization.

18038196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 18038196 is about 4247.1397434038. The cubic root of 18038196 is about 262.2593822288.

It can be divided in two parts, 1803 and 8196, that added together give a palindrome (9999).

The spelling of 18038196 in words is "eighteen million, thirty-eight thousand, one hundred ninety-six".