6861985 has 16 divisors (see below), whose sum is σ = 8925840. Its totient is φ = 5034240.

The previous prime is 6861977. The next prime is 6861997. The reversal of 6861985 is 5891686.

It can be written as a sum of positive squares in 8 ways, for example, as 65536 + 6796449 = 256^2 + 2607^2 .

It is not a de Polignac number, because 6861985 - 2³ = 6861977 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14655 + ... + 15115.

It is an arithmetic number, because the mean of its divisors is an integer number (557865).

Almost surely, 2^6861985 is an apocalyptic number.

6861985 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6861985 is a deficient number, since it is larger than the sum of its proper divisors (2063855).

6861985 is a wasteful number, since it uses less digits than its factorization.

6861985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708.

The product of its digits is 103680, while the sum is 43.

The square root of 6861985 is about 2619.5390815943. The cubic root of 6861985 is about 190.0275583295.

Subtracting from 6861985 its reverse (5891686), we obtain a cube (970299 = 99³).

The spelling of 6861985 in words is "six million, eight hundred sixty-one thousand, nine hundred eighty-five".