3999778871 has 16 divisors (see below), whose sum is σ = 4447159200. Its totient is φ = 3567024000.

The previous prime is 3999778829. The next prime is 3999778873. The reversal of 3999778871 is 1788779993.

3999778871 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3999778871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3999778873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104585 + ... + 137613.

It is an arithmetic number, because the mean of its divisors is an integer number (277947450).

Almost surely, 2^3999778871 is an apocalyptic number.

3999778871 is a deficient number, since it is larger than the sum of its proper divisors (447380329).

3999778871 is a wasteful number, since it uses less digits than its factorization.

3999778871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33250.

The product of its digits is 48009024, while the sum is 68.

The square root of 3999778871 is about 63243.8050009643. The cubic root of 3999778871 is about 1587.3717997285.

The spelling of 3999778871 in words is "three billion, nine hundred ninety-nine million, seven hundred seventy-eight thousand, eight hundred seventy-one".