18172284 has 48 divisors (see below), whose sum is σ = 48074880. Its totient is φ = 5296320.

The previous prime is 18172283. The next prime is 18172309. The reversal of 18172284 is 48227181.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18172283) 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, 102 + ... + 6029.

It is an arithmetic number, because the mean of its divisors is an integer number (1001560).

Almost surely, 2^18172284 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 18172284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24037440).

18172284 is an abundant number, since it is smaller than the sum of its proper divisors (29902596).

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

18172284 is a wasteful number, since it uses less digits than its factorization.

18172284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6170 (or 6168 counting only the distinct ones).

The product of its digits is 7168, while the sum is 33.

The square root of 18172284 is about 4262.8961985955. The cubic root of 18172284 is about 262.9076188622.

The spelling of 18172284 in words is "eighteen million, one hundred seventy-two thousand, two hundred eighty-four".