6440759 has 12 divisors (see below), whose sum is σ = 7281936. Its totient is φ = 5683392.

The previous prime is 6440747. The next prime is 6440771. The reversal of 6440759 is 9570446.

It is an interprime number because it is at equal distance from previous prime (6440747) and next prime (6440771).

It is not a de Polignac number, because 6440759 - 2¹² = 6436663 is a prime.

It is a Duffinian number.

6440759 is a modest number, since divided by 759 gives 644 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440779) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3059 + ... + 4715.

It is an arithmetic number, because the mean of its divisors is an integer number (606828).

Almost surely, 2^6440759 is an apocalyptic number.

6440759 is a deficient number, since it is larger than the sum of its proper divisors (841177).

6440759 is a wasteful number, since it uses less digits than its factorization.

6440759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1706 (or 1693 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 6440759 is about 2537.8650476335. The cubic root of 6440759 is about 186.0568581713.

The spelling of 6440759 in words is "six million, four hundred forty thousand, seven hundred fifty-nine".