8191040 has 112 divisors (see below), whose sum is σ = 23042880. Its totient is φ = 2734080.

The previous prime is 8190997. The next prime is 8191049. The reversal of 8191040 is 401918.

It is a junction number, because it is equal to n+sod(n) for n = 8190997 and 8191015.

It is not an unprimeable number, because it can be changed into a prime (8191049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45671 + ... + 45849.

It is an arithmetic number, because the mean of its divisors is an integer number (205740).

Almost surely, 2^8191040 is an apocalyptic number.

8191040 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8191040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11521440).

8191040 is an abundant number, since it is smaller than the sum of its proper divisors (14851840).

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

8191040 is a wasteful number, since it uses less digits than its factorization.

8191040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220 (or 210 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 8191040 is about 2861.9993011879. Note that the first 3 decimals coincide. The cubic root of 8191040 is about 201.5794931690.

Adding to 8191040 its reverse (401918), we get a palindrome (8592958).

The spelling of 8191040 in words is "eight million, one hundred ninety-one thousand, forty".