18199272 has 96 divisors (see below), whose sum is σ = 56393280. Its totient is φ = 4792320.

The previous prime is 18199261. The next prime is 18199297. The reversal of 18199272 is 27299181.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 18199272.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28072 + ... + 28712.

It is an arithmetic number, because the mean of its divisors is an integer number (587430).

Almost surely, 2^18199272 is an apocalyptic number.

18199272 is a gapful number since it is divisible by the number (12) 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 18199272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28196640).

18199272 is an abundant number, since it is smaller than the sum of its proper divisors (38194008).

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

18199272 is a wasteful number, since it uses less digits than its factorization.

18199272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683 (or 666 counting only the distinct ones).

The product of its digits is 18144, while the sum is 39.

The square root of 18199272 is about 4266.0604777710. The cubic root of 18199272 is about 263.0377041656.

Subtracting 18199272 from its reverse (27299181), we obtain a palindrome (9099909).

The spelling of 18199272 in words is "eighteen million, one hundred ninety-nine thousand, two hundred seventy-two".