3989726442 has 80 divisors (see below), whose sum is σ = 9723471912. Its totient is φ = 1215388800.

The previous prime is 3989726431. The next prime is 3989726449. The reversal of 3989726442 is 2446279893.

3989726442 is a `hidden beast` number, since 3 + 98 + 97 + 26 + 442 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3755360961 + 234365481 = 61281^2 + 15309^2 .

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 (3989726449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 203328 + ... + 222084.

Almost surely, 2^3989726442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3989726442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4861735956).

3989726442 is an abundant number, since it is smaller than the sum of its proper divisors (5733745470).

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

3989726442 is a wasteful number, since it uses less digits than its factorization.

3989726442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18885 (or 18876 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 54.

The square root of 3989726442 is about 63164.2813780067. The cubic root of 3989726442 is about 1586.0408654084.

The spelling of 3989726442 in words is "three billion, nine hundred eighty-nine million, seven hundred twenty-six thousand, four hundred forty-two".