3999999999 has 8 divisors (see below), whose sum is σ = 5367304240. Its totient is φ = 2649681216.

The previous prime is 3999999979. The next prime is 4000000007. The reversal of 3999999999 is 9999999993.

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

It is not a de Polignac number, because 3999999999 - 2²³ = 3991611391 is a prime.

It is a Duffinian number.

3999999999 is a modest number, since divided by 99999 gives 39999 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3999999919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4245814 + ... + 4246755.

It is an arithmetic number, because the mean of its divisors is an integer number (670913030).

Almost surely, 2^3999999999 is an apocalyptic number.

3999999999 is a deficient number, since it is larger than the sum of its proper divisors (1367304241).

3999999999 is a wasteful number, since it uses less digits than its factorization.

3999999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8492729.

The product of its digits is 1162261467, while the sum is 84.

The square root of 3999999999 is about 63245.5531954619. The cubic root of 3999999999 is about 1587.4010518359.

The spelling of 3999999999 in words is "three billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".