6440042 has 16 divisors (see below), whose sum is σ = 11689920. Its totient is φ = 2597568.

The previous prime is 6440041. The next prime is 6440089. The reversal of 6440042 is 2400446.

It is a junction number, because it is equal to n+sod(n) for n = 6439996 and 6440023.

It is not an unprimeable number, because it can be changed into a prime (6440041) 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, 13292 + ... + 13767.

It is an arithmetic number, because the mean of its divisors is an integer number (730620).

Almost surely, 2^6440042 is an apocalyptic number.

6440042 is a deficient number, since it is larger than the sum of its proper divisors (5249878).

6440042 is a wasteful number, since it uses less digits than its factorization.

6440042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27085.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 6440042 is about 2537.7237832357. The cubic root of 6440042 is about 186.0499538237.

Adding to 6440042 its reverse (2400446), we get a palindrome (8840488).

The spelling of 6440042 in words is "six million, four hundred forty thousand, forty-two".