6440907 has 16 divisors (see below), whose sum is σ = 9504000. Its totient is φ = 3847200.

The previous prime is 6440893. The next prime is 6440933. The reversal of 6440907 is 7090446.

6440907 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6440907 - 2⁴ = 6440891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6440947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 969 + ... + 3717.

It is an arithmetic number, because the mean of its divisors is an integer number (594000).

Almost surely, 2^6440907 is an apocalyptic number.

6440907 is a deficient number, since it is larger than the sum of its proper divisors (3063093).

6440907 is a wasteful number, since it uses less digits than its factorization.

6440907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2834.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 6440907 is about 2537.8942058329. The cubic root of 6440907 is about 186.0582832727.

The spelling of 6440907 in words is "six million, four hundred forty thousand, nine hundred seven".