18550506 has 32 divisors (see below), whose sum is σ = 40360320. Its totient is φ = 5649984.

The previous prime is 18550457. The next prime is 18550507. The reversal of 18550506 is 60505581.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18550507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6880 + ... + 9188.

It is an arithmetic number, because the mean of its divisors is an integer number (1261260).

Almost surely, 2^18550506 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18550506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20180160).

18550506 is an abundant number, since it is smaller than the sum of its proper divisors (21809814).

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

18550506 is a wasteful number, since it uses less digits than its factorization.

18550506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2430.

The product of its (nonzero) digits is 6000, while the sum is 30.

The square root of 18550506 is about 4307.0298350487. The cubic root of 18550506 is about 264.7190852558.

The spelling of 18550506 in words is "eighteen million, five hundred fifty thousand, five hundred six".