3991696 has 20 divisors (see below), whose sum is σ = 8070912. Its totient is φ = 1908896.

The previous prime is 3991693. The next prime is 3991703. The reversal of 3991696 is 6961993.

It is not an unprimeable number, because it can be changed into a prime (3991693) 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, 5056 + ... + 5791.

Almost surely, 2^3991696 is an apocalyptic number.

It is an amenable number.

3991696 is an abundant number, since it is smaller than the sum of its proper divisors (4079216).

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

3991696 is a wasteful number, since it uses less digits than its factorization.

3991696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10878 (or 10872 counting only the distinct ones).

The product of its digits is 78732, while the sum is 43.

The square root of 3991696 is about 1997.9229214362. The cubic root of 3991696 is about 158.6301809413.

The spelling of 3991696 in words is "three million, nine hundred ninety-one thousand, six hundred ninety-six".