6861986 has 8 divisors (see below), whose sum is σ = 10387740. Its totient is φ = 3399408.

The previous prime is 6861977. The next prime is 6861997. The reversal of 6861986 is 6891686.

It can be written as a sum of positive squares in 2 ways, for example, as 6630625 + 231361 = 2575^2 + 481^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15521 + ... + 15956.

Almost surely, 2^6861986 is an apocalyptic number.

6861986 is a deficient number, since it is larger than the sum of its proper divisors (3525754).

6861986 is a wasteful number, since it uses less digits than its factorization.

6861986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31588.

The product of its digits is 124416, while the sum is 44.

The square root of 6861986 is about 2619.5392724676. The cubic root of 6861986 is about 190.0275675604.

The spelling of 6861986 in words is "six million, eight hundred sixty-one thousand, nine hundred eighty-six".