8138791 has 4 divisors (see below), whose sum is σ = 8144784. Its totient is φ = 8132800.

The previous prime is 8138789. The next prime is 8138807. The reversal of 8138791 is 1978318.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 8138791 - 2¹ = 8138789 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8138791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8138761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126 + ... + 4036.

It is an arithmetic number, because the mean of its divisors is an integer number (2036196).

Almost surely, 2^8138791 is an apocalyptic number.

8138791 is a deficient number, since it is larger than the sum of its proper divisors (5993).

8138791 is a wasteful number, since it uses less digits than its factorization.

8138791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5992.

The product of its digits is 12096, while the sum is 37.

The square root of 8138791 is about 2852.8566385292. The cubic root of 8138791 is about 201.1499668747.

It can be divided in two parts, 813 and 8791, that added together give a square (9604 = 98²).

The spelling of 8138791 in words is "eight million, one hundred thirty-eight thousand, seven hundred ninety-one".