3931668 has 72 divisors (see below), whose sum is σ = 11088896. Its totient is φ = 1166400.

The previous prime is 3931667. The next prime is 3931687. The reversal of 3931668 is 8661393.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3931661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14373 + ... + 14643.

Almost surely, 2^3931668 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3931668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5544448).

3931668 is an abundant number, since it is smaller than the sum of its proper divisors (7157228).

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

3931668 is a wasteful number, since it uses less digits than its factorization.

3931668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325 (or 320 counting only the distinct ones).

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

The square root of 3931668 is about 1982.8434128796. The cubic root of 3931668 is about 157.8309894946.

The spelling of 3931668 in words is "three million, nine hundred thirty-one thousand, six hundred sixty-eight".