3999979859 has 2 divisors, whose sum is σ = 3999979860. Its totient is φ = 3999979858.

The previous prime is 3999979849. The next prime is 3999979877. The reversal of 3999979859 is 9589799993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3999979859 - 2¹⁶ = 3999914323 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3999979859.

It is not a weakly prime, because it can be changed into another prime (3999979829) 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 as a sum of consecutive naturals, namely, 1999989929 + 1999989930.

It is an arithmetic number, because the mean of its divisors is an integer number (1999989930).

Almost surely, 2^3999979859 is an apocalyptic number.

3999979859 is a deficient number, since it is larger than the sum of its proper divisors (1).

3999979859 is an equidigital number, since it uses as much as digits as its factorization.

3999979859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 446410440, while the sum is 77.

The square root of 3999979859 is about 63245.3939745813. The cubic root of 3999979859 is about 1587.3983876433.

The spelling of 3999979859 in words is "three billion, nine hundred ninety-nine million, nine hundred seventy-nine thousand, eight hundred fifty-nine".