8138928427 has 4 divisors (see below), whose sum is σ = 9301632496. Its totient is φ = 6976224360.

The previous prime is 8138928403. The next prime is 8138928431. The reversal of 8138928427 is 7248298318.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7248298318 = 2 ⋅3624149159.

It is not a de Polignac number, because 8138928427 - 2²³ = 8130539819 is a prime.

It is a super-3 number, since 3×8138928427³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8138928437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 581352024 + ... + 581352037.

It is an arithmetic number, because the mean of its divisors is an integer number (2325408124).

Almost surely, 2^8138928427 is an apocalyptic number.

8138928427 is a deficient number, since it is larger than the sum of its proper divisors (1162704069).

8138928427 is a wasteful number, since it uses less digits than its factorization.

8138928427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1162704068.

The product of its digits is 1548288, while the sum is 52.

The square root of 8138928427 is about 90216.0098153316. The cubic root of 8138928427 is about 2011.5109903638.

The spelling of 8138928427 in words is "eight billion, one hundred thirty-eight million, nine hundred twenty-eight thousand, four hundred twenty-seven".