18634906238 has 8 divisors (see below), whose sum is σ = 30102540888. Its totient is φ = 8600725944.

The previous prime is 18634906229. The next prime is 18634906253. The reversal of 18634906238 is 83260943681.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 358363556 + ... + 358363607.

It is an arithmetic number, because the mean of its divisors is an integer number (3762817611).

Almost surely, 2^18634906238 is an apocalyptic number.

18634906238 is a deficient number, since it is larger than the sum of its proper divisors (11467634650).

18634906238 is a wasteful number, since it uses less digits than its factorization.

18634906238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716727178.

The product of its (nonzero) digits is 1492992, while the sum is 50.

The spelling of 18634906238 in words is "eighteen billion, six hundred thirty-four million, nine hundred six thousand, two hundred thirty-eight".