18550906 has 16 divisors (see below), whose sum is σ = 30774528. Its totient is φ = 8316000.

The previous prime is 18550891. The next prime is 18550907. The reversal of 18550906 is 60905581.

It is a super-2 number, since 2×18550906² = 688272226841672, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18550907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4170 + ... + 7381.

It is an arithmetic number, because the mean of its divisors is an integer number (1923408).

Almost surely, 2^18550906 is an apocalyptic number.

18550906 is a deficient number, since it is larger than the sum of its proper divisors (12223622).

18550906 is a wasteful number, since it uses less digits than its factorization.

18550906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11637.

The product of its (nonzero) digits is 10800, while the sum is 34.

The square root of 18550906 is about 4307.0762705111. The cubic root of 18550906 is about 264.7209879329.

The spelling of 18550906 in words is "eighteen million, five hundred fifty thousand, nine hundred six".