6642309 has 4 divisors (see below), whose sum is σ = 8856416. Its totient is φ = 4428204.

The previous prime is 6642301. The next prime is 6642319. The reversal of 6642309 is 9032466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 6642309 - 2³ = 6642301 is a prime.

It is a D-number.

It is a Duffinian number.

6642309 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6642301) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1107049 + ... + 1107054.

It is an arithmetic number, because the mean of its divisors is an integer number (2214104).

Almost surely, 2^6642309 is an apocalyptic number.

It is an amenable number.

6642309 is a deficient number, since it is larger than the sum of its proper divisors (2214107).

6642309 is a wasteful number, since it uses less digits than its factorization.

6642309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2214106.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 6642309 is about 2577.2677392929. The cubic root of 6642309 is about 187.9777116326.

The spelling of 6642309 in words is "six million, six hundred forty-two thousand, three hundred nine".