18856224 has 72 divisors (see below), whose sum is σ = 54044172. Its totient is φ = 6236160.

The previous prime is 18856219. The next prime is 18856267. The reversal of 18856224 is 42265881.

It can be written as a sum of positive squares in 2 ways, for example, as 18766224 + 90000 = 4332^2 + 300^2 .

It is a tau number, because it is divible by the number of its divisors (72).

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66964 + ... + 67244.

Almost surely, 2^18856224 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 18856224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27022086).

18856224 is an abundant number, since it is smaller than the sum of its proper divisors (35187948).

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

18856224 is a wasteful number, since it uses less digits than its factorization.

18856224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530 (or 519 counting only the distinct ones).

The product of its digits is 30720, while the sum is 36.

The square root of 18856224 is about 4342.3753868131. The cubic root of 18856224 is about 266.1653860598.

The spelling of 18856224 in words is "eighteen million, eight hundred fifty-six thousand, two hundred twenty-four".