3931686 has 32 divisors (see below), whose sum is σ = 9532800. Its totient is φ = 1191240.

The previous prime is 3931667. The next prime is 3931687. The reversal of 3931686 is 6861393.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 3931686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3931687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2716 + ... + 3903.

It is an arithmetic number, because the mean of its divisors is an integer number (297900).

Almost surely, 2^3931686 is an apocalyptic number.

3931686 is an abundant number, since it is smaller than the sum of its proper divisors (5601114).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3931686 is a wasteful number, since it uses less digits than its factorization.

3931686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6641 (or 6635 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 3931686 is about 1982.8479518107. The cubic root of 3931686 is about 157.8312303554.

The spelling of 3931686 in words is "three million, nine hundred thirty-one thousand, six hundred eighty-six".