6398720 has 36 divisors (see below), whose sum is σ = 15330000. Its totient is φ = 2558976.

The previous prime is 6398671. The next prime is 6398723. The reversal of 6398720 is 278936.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6398723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1220 + ... + 3779.

Almost surely, 2^6398720 is an apocalyptic number.

It is an amenable number.

6398720 is an abundant number, since it is smaller than the sum of its proper divisors (8931280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6398720 is an equidigital number, since it uses as much as digits as its factorization.

6398720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5020 (or 5006 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 6398720 is about 2529.5691332715. The cubic root of 6398720 is about 185.6511749490.

The spelling of 6398720 in words is "six million, three hundred ninety-eight thousand, seven hundred twenty".