6440938 has 16 divisors (see below), whose sum is σ = 11075904. Its totient is φ = 2751840.

The previous prime is 6440933. The next prime is 6440939. The reversal of 6440938 is 8390446.

It is not an unprimeable number, because it can be changed into a prime (6440933) 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, 6406 + ... + 7342.

It is an arithmetic number, because the mean of its divisors is an integer number (692244).

Almost surely, 2^6440938 is an apocalyptic number.

6440938 is a deficient number, since it is larger than the sum of its proper divisors (4634966).

6440938 is a wasteful number, since it uses less digits than its factorization.

6440938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1437.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 6440938 is about 2537.9003132511. The cubic root of 6440938 is about 186.0585817709.

The spelling of 6440938 in words is "six million, four hundred forty thousand, nine hundred thirty-eight".