18321006 has 32 divisors (see below), whose sum is σ = 40435200. Its totient is φ = 5487680.

The previous prime is 18320993. The next prime is 18321013. The reversal of 18321006 is 60012381.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4315 + ... + 7433.

It is an arithmetic number, because the mean of its divisors is an integer number (1263600).

Almost surely, 2^18321006 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18321006, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20217600).

18321006 is an abundant number, since it is smaller than the sum of its proper divisors (22114194).

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

18321006 is a wasteful number, since it uses less digits than its factorization.

18321006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3224.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 18321006 is about 4280.3044284256. The cubic root of 18321006 is about 263.6228832728.

Adding to 18321006 its reverse (60012381), we get a palindrome (78333387).

The spelling of 18321006 in words is "eighteen million, three hundred twenty-one thousand, six".