18106506 has 48 divisors (see below), whose sum is σ = 45059040. Its totient is φ = 5196960.

The previous prime is 18106499. The next prime is 18106507. The reversal of 18106506 is 60560181.

18106506 is a `hidden beast` number, since 1 + 8 + 1 + 0 + 650 + 6 = 666.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 18106506.

It is not an unprimeable number, because it can be changed into a prime (18106507) 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, 1356 + ... + 6168.

It is an arithmetic number, because the mean of its divisors is an integer number (938730).

Almost surely, 2^18106506 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18106506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22529520).

18106506 is an abundant number, since it is smaller than the sum of its proper divisors (26952534).

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

18106506 is a wasteful number, since it uses less digits than its factorization.

18106506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4851 (or 4848 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 18106506 is about 4255.1740269935. The cubic root of 18106506 is about 262.5900208257.

Adding to 18106506 its reverse (60560181), we get a palindrome (78666687).

The spelling of 18106506 in words is "eighteen million, one hundred six thousand, five hundred six".