6440807 has 8 divisors (see below), whose sum is σ = 6932592. Its totient is φ = 5961600.

The previous prime is 6440803. The next prime is 6440809. The reversal of 6440807 is 7080446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6440807 - 2² = 6440803 is a prime.

It is a super-2 number, since 2×6440807² = 82967989622498, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6440807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2069 + ... + 4142.

It is an arithmetic number, because the mean of its divisors is an integer number (866574).

Almost surely, 2^6440807 is an apocalyptic number.

6440807 is a deficient number, since it is larger than the sum of its proper divisors (491785).

6440807 is a wasteful number, since it uses less digits than its factorization.

6440807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6289.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 6440807 is about 2537.8745043835. The cubic root of 6440807 is about 186.0573203688.

The spelling of 6440807 in words is "six million, four hundred forty thousand, eight hundred seven".