6420309 has 16 divisors (see below), whose sum is σ = 10298880. Its totient is φ = 3475440.

The previous prime is 6420307. The next prime is 6420343. The reversal of 6420309 is 9030246.

It is not a de Polignac number, because 6420309 - 2¹ = 6420307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6420307) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7647 + ... + 8444.

It is an arithmetic number, because the mean of its divisors is an integer number (643680).

Almost surely, 2^6420309 is an apocalyptic number.

It is an amenable number.

6420309 is a deficient number, since it is larger than the sum of its proper divisors (3878571).

6420309 is a wasteful number, since it uses less digits than its factorization.

6420309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16120.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 6420309 is about 2533.8328674165. The cubic root of 6420309 is about 185.8597335365.

The spelling of 6420309 in words is "six million, four hundred twenty thousand, three hundred nine".