3999706128 has 240 divisors, whose sum is σ = 12978044352. Its totient is φ = 1181952000.

The previous prime is 3999706121. The next prime is 3999706147. The reversal of 3999706128 is 8216079993.

It is a super-2 number, since 2×3999706128² = 31995298220721504768, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (3999706121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1752348 + ... + 1754628.

Almost surely, 2^3999706128 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 3999706128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6489022176).

3999706128 is an abundant number, since it is smaller than the sum of its proper divisors (8978338224).

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

3999706128 is a wasteful number, since it uses less digits than its factorization.

3999706128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2356 (or 2338 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 54.

The square root of 3999706128 is about 63243.2298985433. The cubic root of 3999706128 is about 1587.3621766227.

The spelling of 3999706128 in words is "three billion, nine hundred ninety-nine million, seven hundred six thousand, one hundred twenty-eight".