8687391 has 8 divisors (see below), whose sum is σ = 12264624. Its totient is φ = 5450880.

The previous prime is 8687387. The next prime is 8687401. The reversal of 8687391 is 1937868.

8687391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8687391 - 2² = 8687387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8687321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85120 + ... + 85221.

It is an arithmetic number, because the mean of its divisors is an integer number (1533078).

Almost surely, 2^8687391 is an apocalyptic number.

8687391 is a deficient number, since it is larger than the sum of its proper divisors (3577233).

8687391 is a wasteful number, since it uses less digits than its factorization.

8687391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170361.

The product of its digits is 72576, while the sum is 42.

The square root of 8687391 is about 2947.4380400612. The cubic root of 8687391 is about 205.5716032056.

The spelling of 8687391 in words is "eight million, six hundred eighty-seven thousand, three hundred ninety-one".