6857009 has 4 divisors (see below), whose sum is σ = 6906480. Its totient is φ = 6807540.

The previous prime is 6857003. The next prime is 6857023. The reversal of 6857009 is 9007586.

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 a cyclic number.

It is not a de Polignac number, because 6857009 - 2¹² = 6852913 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6857009.

It is not an unprimeable number, because it can be changed into a prime (6857003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24527 + ... + 24804.

It is an arithmetic number, because the mean of its divisors is an integer number (1726620).

Almost surely, 2^6857009 is an apocalyptic number.

It is an amenable number.

6857009 is a deficient number, since it is larger than the sum of its proper divisors (49471).

6857009 is a wasteful number, since it uses less digits than its factorization.

6857009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49470.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 6857009 is about 2618.5891239368. The cubic root of 6857009 is about 189.9816141027.

The spelling of 6857009 in words is "six million, eight hundred fifty-seven thousand, nine".