4005161994 has 32 divisors (see below), whose sum is σ = 8628240384. Its totient is φ = 1235813040.

The previous prime is 4005161939. The next prime is 4005162023. The reversal of 4005161994 is 4991615004.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 463834 + ... + 472389.

It is an arithmetic number, because the mean of its divisors is an integer number (269632512).

Almost surely, 2^4005161994 is an apocalyptic number.

4005161994 is an abundant number, since it is smaller than the sum of its proper divisors (4623078390).

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

4005161994 is a wasteful number, since it uses less digits than its factorization.

4005161994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936282.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 4005161994 is about 63286.3491915911. The cubic root of 4005161994 is about 1588.0836046668.

Adding to 4005161994 its reverse (4991615004), we get a palindrome (8996776998).

The spelling of 4005161994 in words is "four billion, five million, one hundred sixty-one thousand, nine hundred ninety-four".