3861686 has 16 divisors (see below), whose sum is σ = 6251904. Its totient is φ = 1782144.

The previous prime is 3861659. The next prime is 3861709. The reversal of 3861686 is 6861683.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 731 + ... + 2873.

It is an arithmetic number, because the mean of its divisors is an integer number (390744).

Almost surely, 2^3861686 is an apocalyptic number.

3861686 is a deficient number, since it is larger than the sum of its proper divisors (2390218).

3861686 is a wasteful number, since it uses less digits than its factorization.

3861686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2215.

The product of its digits is 41472, while the sum is 38.

The square root of 3861686 is about 1965.1172992979. The cubic root of 3861686 is about 156.8889365565. Note that the first 3 decimals are identical.

The spelling of 3861686 in words is "three million, eight hundred sixty-one thousand, six hundred eighty-six".