8240040 has 96 divisors (see below), whose sum is σ = 27406080. Its totient is φ = 2146176.

The previous prime is 8240033. The next prime is 8240041. The reversal of 8240040 is 400428.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 8239995 and 8240022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8240041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16677 + ... + 17163.

It is an arithmetic number, because the mean of its divisors is an integer number (285480).

Almost surely, 2^8240040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8240040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13703040).

8240040 is an abundant number, since it is smaller than the sum of its proper divisors (19166040).

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

8240040 is a wasteful number, since it uses less digits than its factorization.

8240040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551 (or 544 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 8240040 is about 2870.5469862032. The cubic root of 8240040 is about 201.9806536385.

Adding to 8240040 its reverse (400428), we get a palindrome (8640468).

The spelling of 8240040 in words is "eight million, two hundred forty thousand, forty".