3998561712 has 80 divisors (see below), whose sum is σ = 10524564480. Its totient is φ = 1307808000.

The previous prime is 3998561711. The next prime is 3998561737. The reversal of 3998561712 is 2171658993.

Its product of digits (816480) is a multiple of the sum of its prime factors (3402).

It is not an unprimeable number, because it can be changed into a prime (3998561711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1401087 + ... + 1403937.

It is an arithmetic number, because the mean of its divisors is an integer number (131557056).

Almost surely, 2^3998561712 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 3998561712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5262282240).

3998561712 is an abundant number, since it is smaller than the sum of its proper divisors (6526002768).

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

3998561712 is a wasteful number, since it uses less digits than its factorization.

3998561712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3402 (or 3396 counting only the distinct ones).

The product of its digits is 816480, while the sum is 51.

The square root of 3998561712 is about 63234.1815160124. The cubic root of 3998561712 is about 1587.2107675024.

The spelling of 3998561712 in words is "three billion, nine hundred ninety-eight million, five hundred sixty-one thousand, seven hundred twelve".