6857842 has 4 divisors (see below), whose sum is σ = 10286766. Its totient is φ = 3428920.

The previous prime is 6857831. The next prime is 6857849. The reversal of 6857842 is 2487586.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2487586 = 2 ⋅1243793.

It can be written as a sum of positive squares in only one way, i.e., 6754801 + 103041 = 2599^2 + 321^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6857795 and 6857804.

It is not an unprimeable number, because it can be changed into a prime (6857849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1714459 + ... + 1714462.

Almost surely, 2^6857842 is an apocalyptic number.

6857842 is a deficient number, since it is larger than the sum of its proper divisors (3428924).

6857842 is a wasteful number, since it uses less digits than its factorization.

6857842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3428923.

The product of its digits is 107520, while the sum is 40.

The square root of 6857842 is about 2618.7481742237. The cubic root of 6857842 is about 189.9893068774.

The spelling of 6857842 in words is "six million, eight hundred fifty-seven thousand, eight hundred forty-two".