3998701280 has 192 divisors, whose sum is σ = 11096289792. Its totient is φ = 1333463040.

The previous prime is 3998701243. The next prime is 3998701309. The reversal of 3998701280 is 821078993.

It is a super-2 number, since 2×3998701280² = 31979223853347276800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7309967 + ... + 7310513.

It is an arithmetic number, because the mean of its divisors is an integer number (57793176).

Almost surely, 2^3998701280 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 3998701280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5548144896).

3998701280 is an abundant number, since it is smaller than the sum of its proper divisors (7097588512).

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

3998701280 is a wasteful number, since it uses less digits than its factorization.

3998701280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737 (or 729 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 47.

The square root of 3998701280 is about 63235.2850867299. The cubic root of 3998701280 is about 1587.2292342471.

The spelling of 3998701280 in words is "three billion, nine hundred ninety-eight million, seven hundred one thousand, two hundred eighty".