3991709952 has 162 divisors, whose sum is σ = 11795536662. Its totient is φ = 1298239488.

The previous prime is 3991709941. The next prime is 3991710029. The reversal of 3991709952 is 2599071993.

It can be written as a sum of positive squares in only one way, i.e., 2453815296 + 1537894656 = 49536^2 + 39216^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4259628 + ... + 4260564.

Almost surely, 2^3991709952 is an apocalyptic number.

3991709952 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3991709952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5897768331).

3991709952 is an abundant number, since it is smaller than the sum of its proper divisors (7803826710).

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

3991709952 is an equidigital number, since it uses as much as digits as its factorization.

3991709952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1045 (or 985 counting only the distinct ones).

The product of its (nonzero) digits is 1377810, while the sum is 54.

The square root of 3991709952 is about 63179.9806267777. The cubic root of 3991709952 is about 1586.3036575880.

The spelling of 3991709952 in words is "three billion, nine hundred ninety-one million, seven hundred nine thousand, nine hundred fifty-two".