9867791 has 4 divisors (see below), whose sum is σ = 10077792. Its totient is φ = 9657792.

The previous prime is 9867779. The next prime is 9867797. The reversal of 9867791 is 1977689.

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 9867791 - 2¹⁰ = 9866767 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 209953 = 9867791 / (9 + 8 + 6 + 7 + 7 + 9 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9867797) 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, 104930 + ... + 105023.

It is an arithmetic number, because the mean of its divisors is an integer number (2519448).

Almost surely, 2^9867791 is an apocalyptic number.

9867791 is a deficient number, since it is larger than the sum of its proper divisors (210001).

9867791 is a wasteful number, since it uses less digits than its factorization.

9867791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210000.

The product of its digits is 190512, while the sum is 47.

The square root of 9867791 is about 3141.3040285843. The cubic root of 9867791 is about 214.4898016063.

The spelling of 9867791 in words is "nine million, eight hundred sixty-seven thousand, seven hundred ninety-one".