6857749 has 8 divisors (see below), whose sum is σ = 7577280. Its totient is φ = 6173376.

The previous prime is 6857743. The next prime is 6857759. The reversal of 6857749 is 9477586.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 6857749 - 2⁷ = 6857621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6857699 and 6857708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6857743) 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, 8379 + ... + 9160.

It is an arithmetic number, because the mean of its divisors is an integer number (947160).

Almost surely, 2^6857749 is an apocalyptic number.

It is an amenable number.

6857749 is a deficient number, since it is larger than the sum of its proper divisors (719531).

6857749 is a wasteful number, since it uses less digits than its factorization.

6857749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17579.

The product of its digits is 423360, while the sum is 46.

The square root of 6857749 is about 2618.7304175879. The cubic root of 6857749 is about 189.9884480511.

The spelling of 6857749 in words is "six million, eight hundred fifty-seven thousand, seven hundred forty-nine".