18223272 has 64 divisors (see below), whose sum is σ = 50976000. Its totient is φ = 6031872.

The previous prime is 18223267. The next prime is 18223273. The reversal of 18223272 is 27232281.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (18223273) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51448 + ... + 51800.

It is an arithmetic number, because the mean of its divisors is an integer number (796500).

Almost surely, 2^18223272 is an apocalyptic number.

18223272 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 18223272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25488000).

18223272 is an abundant number, since it is smaller than the sum of its proper divisors (32752728).

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

18223272 is a wasteful number, since it uses less digits than its factorization.

18223272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607 (or 597 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 18223272 is about 4268.8724506595. The cubic root of 18223272 is about 263.1532789703.

Subtracting 18223272 from its reverse (27232281), we obtain a palindrome (9009009).

The spelling of 18223272 in words is "eighteen million, two hundred twenty-three thousand, two hundred seventy-two".