8391340 has 12 divisors (see below), whose sum is σ = 17621856. Its totient is φ = 3356528.

The previous prime is 8391337. The next prime is 8391349. The reversal of 8391340 is 431938.

It is a junction number, because it is equal to n+sod(n) for n = 8391299 and 8391308.

It is not an unprimeable number, because it can be changed into a prime (8391349) 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 3 ways as a sum of consecutive naturals, for example, 209764 + ... + 209803.

It is an arithmetic number, because the mean of its divisors is an integer number (1468488).

Almost surely, 2^8391340 is an apocalyptic number.

It is an amenable number.

8391340 is an abundant number, since it is smaller than the sum of its proper divisors (9230516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8391340 is a wasteful number, since it uses less digits than its factorization.

8391340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419576 (or 419574 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 8391340 is about 2896.7809720447. The cubic root of 8391340 is about 203.2093902598.

The spelling of 8391340 in words is "eight million, three hundred ninety-one thousand, three hundred forty".