3981686 has 8 divisors (see below), whose sum is σ = 5981040. Its totient is φ = 1988008.

The previous prime is 3981683. The next prime is 3981707. The reversal of 3981686 is 6861893.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3981683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1775 + ... + 3333.

It is an arithmetic number, because the mean of its divisors is an integer number (747630).

Almost surely, 2^3981686 is an apocalyptic number.

3981686 is a deficient number, since it is larger than the sum of its proper divisors (1999354).

3981686 is a wasteful number, since it uses less digits than its factorization.

3981686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2838.

The product of its digits is 62208, while the sum is 41.

The square root of 3981686 is about 1995.4162473028. The cubic root of 3981686 is about 158.4974706612.

The spelling of 3981686 in words is "three million, nine hundred eighty-one thousand, six hundred eighty-six".