6856999 has 2 divisors, whose sum is σ = 6857000. Its totient is φ = 6856998.

The previous prime is 6856973. The next prime is 6857003. The reversal of 6856999 is 9996586.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6856999 - 2¹¹ = 6854951 is a prime.

6856999 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6856919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3428499 + 3428500.

It is an arithmetic number, because the mean of its divisors is an integer number (3428500).

Almost surely, 2^6856999 is an apocalyptic number.

6856999 is a deficient number, since it is larger than the sum of its proper divisors (1).

6856999 is an equidigital number, since it uses as much as digits as its factorization.

6856999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1049760, while the sum is 52.

The square root of 6856999 is about 2618.5872145109. The cubic root of 6856999 is about 189.9815217487.

The spelling of 6856999 in words is "six million, eight hundred fifty-six thousand, nine hundred ninety-nine".