9791218438 has 8 divisors (see below), whose sum is σ = 15193270080. Its totient is φ = 4726795080.

The previous prime is 9791218417. The next prime is 9791218439. The reversal of 9791218438 is 8348121979.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9791218439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84406998 + ... + 84407113.

It is an arithmetic number, because the mean of its divisors is an integer number (1899158760).

Almost surely, 2^9791218438 is an apocalyptic number.

9791218438 is a deficient number, since it is larger than the sum of its proper divisors (5402051642).

9791218438 is a wasteful number, since it uses less digits than its factorization.

9791218438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168814142.

The product of its digits is 870912, while the sum is 52.

The square root of 9791218438 is about 98950.5858395998. The cubic root of 9791218438 is about 2139.3355754593.

The spelling of 9791218438 in words is "nine billion, seven hundred ninety-one million, two hundred eighteen thousand, four hundred thirty-eight".