18209106 has 48 divisors (see below), whose sum is σ = 42681600. Its totient is φ = 5590944.

The previous prime is 18209101. The next prime is 18209137. The reversal of 18209106 is 60190281.

It is a self number, because there is not a number n which added to its sum of digits gives 18209106.

It is not an unprimeable number, because it can be changed into a prime (18209101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11935 + ... + 13373.

It is an arithmetic number, because the mean of its divisors is an integer number (889200).

Almost surely, 2^18209106 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18209106, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21340800).

18209106 is an abundant number, since it is smaller than the sum of its proper divisors (24472494).

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

18209106 is a wasteful number, since it uses less digits than its factorization.

18209106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1503 (or 1500 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 18209106 is about 4267.2129077420. The cubic root of 18209106 is about 263.0850732218.

Adding to 18209106 its reverse (60190281), we get a palindrome (78399387).

The spelling of 18209106 in words is "eighteen million, two hundred nine thousand, one hundred six".