18051906 has 16 divisors (see below), whose sum is σ = 36785664. Its totient is φ = 5903664.

The previous prime is 18051857. The next prime is 18051911. The reversal of 18051906 is 60915081.

It is a happy number.

It is an unprimeable number.

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, 28066 + ... + 28701.

It is an arithmetic number, because the mean of its divisors is an integer number (2299104).

Almost surely, 2^18051906 is an apocalyptic number.

18051906 is an abundant number, since it is smaller than the sum of its proper divisors (18733758).

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

18051906 is a wasteful number, since it uses less digits than its factorization.

18051906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56825.

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 18051906 is about 4248.7534642528. The cubic root of 18051906 is about 262.3258091518.

Adding to 18051906 its reverse (60915081), we get a palindrome (78966987).

The spelling of 18051906 in words is "eighteen million, fifty-one thousand, nine hundred six".