8391689 has 4 divisors (see below), whose sum is σ = 8470224. Its totient is φ = 8313156.

The previous prime is 8391679. The next prime is 8391697. The reversal of 8391689 is 9861938.

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 8391689 - 2⁸ = 8391433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8391679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39107 + ... + 39320.

It is an arithmetic number, because the mean of its divisors is an integer number (2117556).

Almost surely, 2^8391689 is an apocalyptic number.

It is an amenable number.

8391689 is a deficient number, since it is larger than the sum of its proper divisors (78535).

8391689 is a wasteful number, since it uses less digits than its factorization.

8391689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78534.

The product of its digits is 93312, while the sum is 44.

The square root of 8391689 is about 2896.8412106983. The cubic root of 8391689 is about 203.2122074139.

The spelling of 8391689 in words is "eight million, three hundred ninety-one thousand, six hundred eighty-nine".