3999611018 has 16 divisors (see below), whose sum is σ = 6493714920. Its totient is φ = 1836601536.

The previous prime is 3999610999. The next prime is 3999611107. The reversal of 3999611018 is 8101169993.

3999611018 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3966858289 + 32752729 = 62983^2 + 5723^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 385313 + ... + 395556.

Almost surely, 2^3999611018 is an apocalyptic number.

3999611018 is a deficient number, since it is larger than the sum of its proper divisors (2494103902).

3999611018 is a wasteful number, since it uses less digits than its factorization.

3999611018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781081.

The product of its (nonzero) digits is 104976, while the sum is 47.

The square root of 3999611018 is about 63242.4779558803. The cubic root of 3999611018 is about 1587.3495944305.

The spelling of 3999611018 in words is "three billion, nine hundred ninety-nine million, six hundred eleven thousand, eighteen".