8129842391 has 8 divisors (see below), whose sum is σ = 9390620304. Its totient is φ = 6956014720.

The previous prime is 8129842387. The next prime is 8129842421. The reversal of 8129842391 is 1932489218.

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

It is a cyclic number.

It is not a de Polignac number, because 8129842391 - 2² = 8129842387 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 (8129842351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21737360 + ... + 21737733.

It is an arithmetic number, because the mean of its divisors is an integer number (1173827538).

Almost surely, 2^8129842391 is an apocalyptic number.

8129842391 is a deficient number, since it is larger than the sum of its proper divisors (1260777913).

8129842391 is a wasteful number, since it uses less digits than its factorization.

8129842391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43475121.

The product of its digits is 248832, while the sum is 47.

The square root of 8129842391 is about 90165.6386380089. The cubic root of 8129842391 is about 2010.7621830806.

The spelling of 8129842391 in words is "eight billion, one hundred twenty-nine million, eight hundred forty-two thousand, three hundred ninety-one".