8642391 has 4 divisors (see below), whose sum is σ = 11523192. Its totient is φ = 5761592.

The previous prime is 8642383. The next prime is 8642429. The reversal of 8642391 is 1932468.

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

It is a cyclic number.

It is not a de Polignac number, because 8642391 - 2³ = 8642383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8642591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1440396 + ... + 1440401.

It is an arithmetic number, because the mean of its divisors is an integer number (2880798).

Almost surely, 2^8642391 is an apocalyptic number.

8642391 is a deficient number, since it is larger than the sum of its proper divisors (2880801).

8642391 is a wasteful number, since it uses less digits than its factorization.

8642391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2880800.

The product of its digits is 10368, while the sum is 33.

The square root of 8642391 is about 2939.7943805647. The cubic root of 8642391 is about 205.2160403392.

The spelling of 8642391 in words is "eight million, six hundred forty-two thousand, three hundred ninety-one".