3999636042800 has 120 divisors (see below), whose sum is σ = 10206469574496. Its totient is φ = 1500994539520.

The previous prime is 3999636042791. The next prime is 3999636042889. The reversal of 3999636042800 is 82406369993.

It is a self number, because there is not a number n which added to its sum of digits gives 3999636042800.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1227869 + ... + 3083331.

Almost surely, 2^{3999636042800} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3999636042800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5103234787248).

3999636042800 is an abundant number, since it is smaller than the sum of its proper divisors (6206833531696).

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

3999636042800 is a wasteful number, since it uses less digits than its factorization.

3999636042800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1855815 (or 1855804 counting only the distinct ones).

The product of its (nonzero) digits is 15116544, while the sum is 59.

The spelling of 3999636042800 in words is "three trillion, nine hundred ninety-nine billion, six hundred thirty-six million, forty-two thousand, eight hundred".