6855989 has 16 divisors (see below), whose sum is σ = 8156928. Its totient is φ = 5640192.

The previous prime is 6855971. The next prime is 6856009. The reversal of 6855989 is 9895586.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 6855989 - 2²⁰ = 5807413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6855089) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26549 + ... + 26805.

It is an arithmetic number, because the mean of its divisors is an integer number (509808).

Almost surely, 2^6855989 is an apocalyptic number.

It is an amenable number.

6855989 is a deficient number, since it is larger than the sum of its proper divisors (1300939).

6855989 is a wasteful number, since it uses less digits than its factorization.

6855989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404.

The product of its digits is 777600, while the sum is 50.

The square root of 6855989 is about 2618.3943553254. The cubic root of 6855989 is about 189.9721935300.

The spelling of 6855989 in words is "six million, eight hundred fifty-five thousand, nine hundred eighty-nine".