9678391 has 4 divisors (see below), whose sum is σ = 10187800. Its totient is φ = 9168984.

The previous prime is 9678379. The next prime is 9678401. The reversal of 9678391 is 1938769.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9678391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9678341) 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, 254676 + ... + 254713.

It is an arithmetic number, because the mean of its divisors is an integer number (2546950).

Almost surely, 2^9678391 is an apocalyptic number.

9678391 is a deficient number, since it is larger than the sum of its proper divisors (509409).

9678391 is a wasteful number, since it uses less digits than its factorization.

9678391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509408.

The product of its digits is 81648, while the sum is 43.

The square root of 9678391 is about 3111.0112503815. The cubic root of 9678391 is about 213.1086384759.

It can be divided in two parts, 96 and 78391, that added together give a palindrome (78487).

The spelling of 9678391 in words is "nine million, six hundred seventy-eight thousand, three hundred ninety-one".