6440727 has 4 divisors (see below), whose sum is σ = 8587640. Its totient is φ = 4293816.

The previous prime is 6440723. The next prime is 6440737. The reversal of 6440727 is 7270446.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6440727 - 2² = 6440723 is a prime.

It is a D-number.

It is a Duffinian number.

6440727 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 6440694 and 6440703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1073452 + ... + 1073457.

It is an arithmetic number, because the mean of its divisors is an integer number (2146910).

Almost surely, 2^6440727 is an apocalyptic number.

6440727 is a deficient number, since it is larger than the sum of its proper divisors (2146913).

6440727 is a wasteful number, since it uses less digits than its factorization.

6440727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2146912.

The product of its (nonzero) digits is 9408, while the sum is 30.

The square root of 6440727 is about 2537.8587431140. The cubic root of 6440727 is about 186.0565500384.

The spelling of 6440727 in words is "six million, four hundred forty thousand, seven hundred twenty-seven".