18872224 has 48 divisors (see below), whose sum is σ = 42795648. Its totient is φ = 8024832.

The previous prime is 18872221. The next prime is 18872251. The reversal of 18872224 is 42227881.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 18872224.

It is not an unprimeable number, because it can be changed into a prime (18872221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38509 + ... + 38995.

It is an arithmetic number, because the mean of its divisors is an integer number (891576).

Almost surely, 2^18872224 is an apocalyptic number.

18872224 is a gapful number since it is divisible by the number (14) 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 18872224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21397824).

18872224 is an abundant number, since it is smaller than the sum of its proper divisors (23923424).

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

18872224 is a wasteful number, since it uses less digits than its factorization.

18872224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677 (or 669 counting only the distinct ones).

The product of its digits is 14336, while the sum is 34.

The square root of 18872224 is about 4344.2173057986. The cubic root of 18872224 is about 266.2406475441.

The spelling of 18872224 in words is "eighteen million, eight hundred seventy-two thousand, two hundred twenty-four".