18195807238 has 16 divisors (see below), whose sum is σ = 32035862304. Its totient is φ = 7587440640.

The previous prime is 18195807193. The next prime is 18195807239. The reversal of 18195807238 is 83270859181.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18195807239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17563003 + ... + 17564038.

It is an arithmetic number, because the mean of its divisors is an integer number (2002241394).

Almost surely, 2^18195807238 is an apocalyptic number.

18195807238 is a deficient number, since it is larger than the sum of its proper divisors (13840055066).

18195807238 is a wasteful number, since it uses less digits than its factorization.

18195807238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35127087.

The product of its (nonzero) digits is 967680, while the sum is 52.

The spelling of 18195807238 in words is "eighteen billion, one hundred ninety-five million, eight hundred seven thousand, two hundred thirty-eight".