6420705 has 8 divisors (see below), whose sum is σ = 10273152. Its totient is φ = 3424368.

The previous prime is 6420697. The next prime is 6420707. The reversal of 6420705 is 5070246.

It is a happy number.

6420705 is digitally balanced in base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6420705 - 2³ = 6420697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6420707) 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, 214009 + ... + 214038.

It is an arithmetic number, because the mean of its divisors is an integer number (1284144).

Almost surely, 2^6420705 is an apocalyptic number.

It is an amenable number.

6420705 is a deficient number, since it is larger than the sum of its proper divisors (3852447).

6420705 is a wasteful number, since it uses less digits than its factorization.

6420705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428055.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 6420705 is about 2533.9110086978. The cubic root of 6420705 is about 185.8635546891.

The spelling of 6420705 in words is "six million, four hundred twenty thousand, seven hundred five".