3999387264 has 32 divisors (see below), whose sum is σ = 10623373440. Its totient is φ = 1333128960.

The previous prime is 3999387253. The next prime is 3999387317. The reversal of 3999387264 is 4627839993.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 3999387198 and 3999387207.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5207152 + ... + 5207919.

It is an arithmetic number, because the mean of its divisors is an integer number (331980420).

Almost surely, 2^3999387264 is an apocalyptic number.

It is an amenable number.

3999387264 is an abundant number, since it is smaller than the sum of its proper divisors (6623986176).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3999387264 is a wasteful number, since it uses less digits than its factorization.

3999387264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10415088 (or 10415076 counting only the distinct ones).

The product of its digits is 17635968, while the sum is 60.

The square root of 3999387264 is about 63240.7089144326. The cubic root of 3999387264 is about 1587.3199930148.

The spelling of 3999387264 in words is "three billion, nine hundred ninety-nine million, three hundred eighty-seven thousand, two hundred sixty-four".