6749857 has 4 divisors (see below), whose sum is σ = 6755476. Its totient is φ = 6744240.

The previous prime is 6749843. The next prime is 6749861. The reversal of 6749857 is 7589476.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 519841 + 6230016 = 721^2 + 2496^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6749857 is a prime.

It is a Duffinian number.

6749857 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6749887) 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, 198 + ... + 3679.

It is an arithmetic number, because the mean of its divisors is an integer number (1688869).

Almost surely, 2^6749857 is an apocalyptic number.

It is an amenable number.

6749857 is a deficient number, since it is larger than the sum of its proper divisors (5619).

6749857 is a wasteful number, since it uses less digits than its factorization.

6749857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5618.

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

The square root of 6749857 is about 2598.0486908447. The cubic root of 6749857 is about 188.9868228918.

The spelling of 6749857 in words is "six million, seven hundred forty-nine thousand, eight hundred fifty-seven".