8197391 has 8 divisors (see below), whose sum is σ = 8426880. Its totient is φ = 7969752.

The previous prime is 8197381. The next prime is 8197403. The reversal of 8197391 is 1937918.

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 8197391 - 2⁶ = 8197327 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8197331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16046 + ... + 16548.

It is an arithmetic number, because the mean of its divisors is an integer number (1053360).

Almost surely, 2^8197391 is an apocalyptic number.

8197391 is a deficient number, since it is larger than the sum of its proper divisors (229489).

8197391 is a wasteful number, since it uses less digits than its factorization.

8197391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925.

The product of its digits is 13608, while the sum is 38.

The square root of 8197391 is about 2863.1086252533. The cubic root of 8197391 is about 201.6315785625.

The spelling of 8197391 in words is "eight million, one hundred ninety-seven thousand, three hundred ninety-one".