6899985 has 32 divisors (see below), whose sum is σ = 12437760. Its totient is φ = 3674160.

The previous prime is 6899969. The next prime is 6899989. The reversal of 6899985 is 5899986.

It is not a de Polignac number, because 6899985 - 2⁴ = 6899969 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6899989) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10620 + ... + 11250.

It is an arithmetic number, because the mean of its divisors is an integer number (388680).

Almost surely, 2^6899985 is an apocalyptic number.

It is an amenable number.

6899985 is a deficient number, since it is larger than the sum of its proper divisors (5537775).

6899985 is an frugal number, since it uses more digits than its factorization.

6899985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657 (or 639 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 54.

The square root of 6899985 is about 2626.7822521100. The cubic root of 6899985 is about 190.3776882413.

Subtracting from 6899985 its reverse (5899986), we obtain a palindrome (999999).

The spelling of 6899985 in words is "six million, eight hundred ninety-nine thousand, nine hundred eighty-five".