8638391 has 8 divisors (see below), whose sum is σ = 8803200. Its totient is φ = 8475192.

The previous prime is 8638381. The next prime is 8638403. The reversal of 8638391 is 1938368.

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

It is a cyclic number.

It is not a de Polignac number, because 8638391 - 2⁶ = 8638327 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 (8638381) 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, 16256 + ... + 16778.

It is an arithmetic number, because the mean of its divisors is an integer number (1100400).

Almost surely, 2^8638391 is an apocalyptic number.

8638391 is a deficient number, since it is larger than the sum of its proper divisors (164809).

8638391 is a wasteful number, since it uses less digits than its factorization.

8638391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805.

The product of its digits is 31104, while the sum is 38.

The square root of 8638391 is about 2939.1139821382. The cubic root of 8638391 is about 205.1843750729.

The spelling of 8638391 in words is "eight million, six hundred thirty-eight thousand, three hundred ninety-one".