3998572420 has 96 divisors (see below), whose sum is σ = 9013939200. Its totient is φ = 1485563904.

The previous prime is 3998572339. The next prime is 3998572421. The reversal of 3998572420 is 242758993.

It is not an unprimeable number, because it can be changed into a prime (3998572421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4632909 + ... + 4633771.

It is an arithmetic number, because the mean of its divisors is an integer number (93895200).

Almost surely, 2^3998572420 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 3998572420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4506969600).

3998572420 is an abundant number, since it is smaller than the sum of its proper divisors (5015366780).

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

3998572420 is a wasteful number, since it uses less digits than its factorization.

3998572420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1117 (or 1115 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 49.

The square root of 3998572420 is about 63234.2661853524. The cubic root of 3998572420 is about 1587.2121843316.

The spelling of 3998572420 in words is "three billion, nine hundred ninety-eight million, five hundred seventy-two thousand, four hundred twenty".