8129447994 has 8 divisors (see below), whose sum is σ = 16258896000. Its totient is φ = 2709815996.

The previous prime is 8129447993. The next prime is 8129448001. The reversal of 8129447994 is 4997449218.

It is a happy number.

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

8129447994 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (8129447993) 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, 677453994 + ... + 677454005.

It is an arithmetic number, because the mean of its divisors is an integer number (2032362000).

Almost surely, 2^8129447994 is an apocalyptic number.

8129447994 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.

8129447994 is a wasteful number, since it uses less digits than its factorization.

8129447994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1354908004.

The product of its digits is 5225472, while the sum is 57.

The square root of 8129447994 is about 90163.4515421853. The cubic root of 8129447994 is about 2010.7296670178.

The spelling of 8129447994 in words is "eight billion, one hundred twenty-nine million, four hundred forty-seven thousand, nine hundred ninety-four".