8126438729 has 4 divisors (see below), whose sum is σ = 8479762176. Its totient is φ = 7773115284.

The previous prime is 8126438717. The next prime is 8126438737. The reversal of 8126438729 is 9278346218.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8126438729 - 2⁴ = 8126438713 is a prime.

It is a super-2 number, since 2×8126438729² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8126438129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176661689 + ... + 176661734.

It is an arithmetic number, because the mean of its divisors is an integer number (2119940544).

Almost surely, 2^8126438729 is an apocalyptic number.

It is an amenable number.

8126438729 is a deficient number, since it is larger than the sum of its proper divisors (353323447).

8126438729 is a wasteful number, since it uses less digits than its factorization.

8126438729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353323446.

The product of its digits is 1161216, while the sum is 50.

The square root of 8126438729 is about 90146.7621659258. The cubic root of 8126438729 is about 2010.4815335169.

The spelling of 8126438729 in words is "eight billion, one hundred twenty-six million, four hundred thirty-eight thousand, seven hundred twenty-nine".