8712391 has 4 divisors (see below), whose sum is σ = 8748784. Its totient is φ = 8676000.

The previous prime is 8712373. The next prime is 8712397. The reversal of 8712391 is 1932178.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 8712391 - 2¹¹ = 8710343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8712397) 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, 17835 + ... + 18316.

It is an arithmetic number, because the mean of its divisors is an integer number (2187196).

Almost surely, 2^8712391 is an apocalyptic number.

8712391 is a deficient number, since it is larger than the sum of its proper divisors (36393).

8712391 is a wasteful number, since it uses less digits than its factorization.

8712391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36392.

The product of its digits is 3024, while the sum is 31.

The square root of 8712391 is about 2951.6759646005. The cubic root of 8712391 is about 205.7686078111.

The spelling of 8712391 in words is "eight million, seven hundred twelve thousand, three hundred ninety-one".