6440378 has 24 divisors (see below), whose sum is σ = 11455392. Its totient is φ = 2660112.

The previous prime is 6440359. The next prime is 6440383. The reversal of 6440378 is 8730446.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11501 + ... + 12047.

It is an arithmetic number, because the mean of its divisors is an integer number (477308).

Almost surely, 2^6440378 is an apocalyptic number.

6440378 is a deficient number, since it is larger than the sum of its proper divisors (5015014).

6440378 is a wasteful number, since it uses less digits than its factorization.

6440378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614 (or 585 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 6440378 is about 2537.7899834305. The cubic root of 6440378 is about 186.0531893977.

The spelling of 6440378 in words is "six million, four hundred forty thousand, three hundred seventy-eight".