6501440 has 56 divisors (see below), whose sum is σ = 16898112. Its totient is φ = 2362880.

The previous prime is 6501431. The next prime is 6501487. The reversal of 6501440 is 441056.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2597 + ... + 4443.

It is an arithmetic number, because the mean of its divisors is an integer number (301752).

Almost surely, 2^6501440 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 6501440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8449056).

6501440 is an abundant number, since it is smaller than the sum of its proper divisors (10396672).

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

6501440 is a wasteful number, since it uses less digits than its factorization.

6501440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1875 (or 1865 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 6501440 is about 2549.7921483917. The cubic root of 6501440 is about 186.6393384029.

Adding to 6501440 its reverse (441056), we get a palindrome (6942496).

The spelling of 6501440 in words is "six million, five hundred one thousand, four hundred forty".