8138857 has 4 divisors (see below), whose sum is σ = 8144640. Its totient is φ = 8133076.

The previous prime is 8138807. The next prime is 8138861. The reversal of 8138857 is 7588318.

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, 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 8138857 - 2⁷ = 8138729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8138807) 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, 744 + ... + 4102.

It is an arithmetic number, because the mean of its divisors is an integer number (2036160).

Almost surely, 2^8138857 is an apocalyptic number.

It is an amenable number.

8138857 is a deficient number, since it is larger than the sum of its proper divisors (5783).

8138857 is a wasteful number, since it uses less digits than its factorization.

8138857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5782.

The product of its digits is 53760, while the sum is 40.

The square root of 8138857 is about 2852.8682058588. The cubic root of 8138857 is about 201.1505106026.

The spelling of 8138857 in words is "eight million, one hundred thirty-eight thousand, eight hundred fifty-seven".