8415240 has 64 divisors (see below), whose sum is σ = 26352000. Its totient is φ = 2145792.

The previous prime is 8415193. The next prime is 8415241. The reversal of 8415240 is 425148.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 8415240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8415241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1236 + ... + 4284.

It is an arithmetic number, because the mean of its divisors is an integer number (411750).

Almost surely, 2^8415240 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 8415240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13176000).

8415240 is an abundant number, since it is smaller than the sum of its proper divisors (17936760).

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

8415240 is a wasteful number, since it uses less digits than its factorization.

8415240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3086 (or 3082 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 8415240 is about 2900.9033075923. The cubic root of 8415240 is about 203.4021326504.

The spelling of 8415240 in words is "eight million, four hundred fifteen thousand, two hundred forty".