8391493 has 16 divisors (see below), whose sum is σ = 9510336. Its totient is φ = 7338240.

The previous prime is 8391491. The next prime is 8391499. The reversal of 8391493 is 3941938.

It is a cyclic number.

It is not a de Polignac number, because 8391493 - 2¹ = 8391491 is a prime.

Its product of digits (23328) is a multiple of the sum of its prime divisors (324).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8391491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53371 + ... + 53527.

It is an arithmetic number, because the mean of its divisors is an integer number (594396).

Almost surely, 2^8391493 is an apocalyptic number.

It is an amenable number.

8391493 is a deficient number, since it is larger than the sum of its proper divisors (1118843).

8391493 is a wasteful number, since it uses less digits than its factorization.

8391493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324.

The product of its digits is 23328, while the sum is 37.

The square root of 8391493 is about 2896.8073805485. The cubic root of 8391493 is about 203.2106252969.

It can be divided in two parts, 839 and 1493, that added together give a palindrome (2332).

The spelling of 8391493 in words is "eight million, three hundred ninety-one thousand, four hundred ninety-three".