3999779993 has 12 divisors (see below), whose sum is σ = 4397999844. Its totient is φ = 3634884000.

The previous prime is 3999779983. The next prime is 3999780013.

3999779993 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 1426044169 + 2573735824 = 37763^2 + 50732^2 .

It is not a de Polignac number, because 3999779993 - 2¹⁰ = 3999778969 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3999779993.

It is not an unprimeable number, because it can be changed into a prime (3999779923) 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 11 ways as a sum of consecutive naturals, for example, 593543 + ... + 600243.

It is an arithmetic number, because the mean of its divisors is an integer number (366499987).

Almost surely, 2^3999779993 is an apocalyptic number.

It is an amenable number.

3999779993 is a deficient number, since it is larger than the sum of its proper divisors (398219851).

3999779993 is a wasteful number, since it uses less digits than its factorization.

3999779993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11656 (or 11645 counting only the distinct ones).

The product of its digits is 234365481, while the sum is 74.

The square root of 3999779993 is about 63243.8138713977. The cubic root of 3999779993 is about 1587.3719481560.

The spelling of 3999779993 in words is "three billion, nine hundred ninety-nine million, seven hundred seventy-nine thousand, nine hundred ninety-three".