438444642457218 has 8 divisors (see below), whose sum is σ = 876889284914448. Its totient is φ = 146148214152404.

The previous prime is 438444642457183. The next prime is 438444642457249. The reversal of 438444642457218 is 812754246444834.

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

438444642457218 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36537053538096 + ... + 36537053538107.

It is an arithmetic number, because the mean of its divisors is an integer number (109611160614306).

Almost surely, 2^{438444642457218} is an apocalyptic number.

438444642457218 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

438444642457218 is a wasteful number, since it uses less digits than its factorization.

438444642457218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73074107076208.

The product of its digits is 660602880, while the sum is 66.

The spelling of 438444642457218 in words is "four hundred thirty-eight trillion, four hundred forty-four billion, six hundred forty-two million, four hundred fifty-seven thousand, two hundred eighteen".