3991428684723 has 8 divisors (see below), whose sum is σ = 5505418875600. Its totient is φ = 2569195475168.

The previous prime is 3991428684721. The next prime is 3991428684757. The reversal of 3991428684723 is 3274868241993.

3991428684723 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 3991428684723 - 2¹ = 3991428684721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3991428684721) 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, 22939245228 + ... + 22939245401.

It is an arithmetic number, because the mean of its divisors is an integer number (688177359450).

Almost surely, 2^{3991428684723} is an apocalyptic number.

3991428684723 is a deficient number, since it is larger than the sum of its proper divisors (1513990190877).

3991428684723 is a wasteful number, since it uses less digits than its factorization.

3991428684723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45878490661.

The product of its digits is 125411328, while the sum is 66.

The spelling of 3991428684723 in words is "three trillion, nine hundred ninety-one billion, four hundred twenty-eight million, six hundred eighty-four thousand, seven hundred twenty-three".