8438778349 has 4 divisors (see below), whose sum is σ = 8598000636. Its totient is φ = 8279556064.

The previous prime is 8438778347. The next prime is 8438778371. The reversal of 8438778349 is 9438778348.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1998715849 + 6440062500 = 44707^2 + 80250^2 .

It is a cyclic number.

It is not a de Polignac number, because 8438778349 - 2¹ = 8438778347 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8438778347) by changing a digit.

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, 79611064 + ... + 79611169.

It is an arithmetic number, because the mean of its divisors is an integer number (2149500159).

Almost surely, 2^8438778349 is an apocalyptic number.

It is an amenable number.

8438778349 is a deficient number, since it is larger than the sum of its proper divisors (159222287).

8438778349 is a wasteful number, since it uses less digits than its factorization.

8438778349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159222286.

The product of its digits is 32514048, while the sum is 61.

The square root of 8438778349 is about 91862.8235414087. The cubic root of 8438778349 is about 2035.9160212704.

Subtracting 8438778349 from its reverse (9438778348), we obtain a palindrome (999999999).

The spelling of 8438778349 in words is "eight billion, four hundred thirty-eight million, seven hundred seventy-eight thousand, three hundred forty-nine".