6440830 has 24 divisors (see below), whose sum is σ = 12745656. Its totient is φ = 2341680.

The previous prime is 6440821. The next prime is 6440831. The reversal of 6440830 is 380446.

It is a junction number, because it is equal to n+sod(n) for n = 6440795 and 6440804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1452 + ... + 3871.

It is an arithmetic number, because the mean of its divisors is an integer number (531069).

Almost surely, 2^6440830 is an apocalyptic number.

6440830 is a deficient number, since it is larger than the sum of its proper divisors (6304826).

6440830 is a wasteful number, since it uses less digits than its factorization.

6440830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5352 (or 5341 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 6440830 is about 2537.8790357304. The cubic root of 6440830 is about 186.0575418376.

The spelling of 6440830 in words is "six million, four hundred forty thousand, eight hundred thirty".