6399020 has 24 divisors (see below), whose sum is σ = 13872768. Its totient is φ = 2476800.

The previous prime is 6399013. The next prime is 6399023. The reversal of 6399020 is 209936.

6399020 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (6399023) 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, 4541 + ... + 5780.

It is an arithmetic number, because the mean of its divisors is an integer number (578032).

Almost surely, 2^6399020 is an apocalyptic number.

It is an amenable number.

6399020 is an abundant number, since it is smaller than the sum of its proper divisors (7473748).

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

6399020 is a wasteful number, since it uses less digits than its factorization.

6399020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10361 (or 10359 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 6399020 is about 2529.6284312128. The cubic root of 6399020 is about 185.6540762836.

The spelling of 6399020 in words is "six million, three hundred ninety-nine thousand, twenty".