3991686276 has 24 divisors (see below), whose sum is σ = 9315289984. Its totient is φ = 1330368480.

The previous prime is 3991686239. The next prime is 3991686277. The reversal of 3991686276 is 6726861993.

It is a happy number.

3991686276 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (3991686277) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79461 + ... + 119571.

Almost surely, 2^3991686276 is an apocalyptic number.

It is an amenable number.

3991686276 is an abundant number, since it is smaller than the sum of its proper divisors (5323603708).

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

3991686276 is a wasteful number, since it uses less digits than its factorization.

3991686276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48411 (or 48409 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 57.

The square root of 3991686276 is about 63179.7932570217. The cubic root of 3991686276 is about 1586.3005213047.

The spelling of 3991686276 in words is "three billion, nine hundred ninety-one million, six hundred eighty-six thousand, two hundred seventy-six".