6315440 has 40 divisors (see below), whose sum is σ = 14865120. Its totient is φ = 2494976.

The previous prime is 6315433. The next prime is 6315451. The reversal of 6315440 is 445136.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

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, 6677 + ... + 7563.

It is an arithmetic number, because the mean of its divisors is an integer number (371628).

Almost surely, 2^6315440 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 6315440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7432560).

6315440 is an abundant number, since it is smaller than the sum of its proper divisors (8549680).

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

6315440 is a wasteful number, since it uses less digits than its factorization.

6315440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989 (or 983 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 6315440 is about 2513.0539190395. The cubic root of 6315440 is about 184.8422321850.

The spelling of 6315440 in words is "six million, three hundred fifteen thousand, four hundred forty".