3944391558 has 16 divisors (see below), whose sum is σ = 8160810480. Its totient is φ = 1269459296.

The previous prime is 3944391533. The next prime is 3944391559. The reversal of 3944391558 is 8551934493.

3944391558 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 3944391558.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3944391559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11334285 + ... + 11334632.

It is an arithmetic number, because the mean of its divisors is an integer number (510050655).

Almost surely, 2^3944391558 is an apocalyptic number.

3944391558 is an abundant number, since it is smaller than the sum of its proper divisors (4216418922).

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

3944391558 is a wasteful number, since it uses less digits than its factorization.

3944391558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22668951.

The product of its digits is 2332800, while the sum is 51.

The square root of 3944391558 is about 62804.3912318239. The cubic root of 3944391558 is about 1580.0106229591.

The spelling of 3944391558 in words is "three billion, nine hundred forty-four million, three hundred ninety-one thousand, five hundred fifty-eight".