3993644181 has 16 divisors (see below), whose sum is σ = 5710875840. Its totient is φ = 2474709120.

The previous prime is 3993644153. The next prime is 3993644203. The reversal of 3993644181 is 1814463993.

It is not a de Polignac number, because 3993644181 - 2⁶ = 3993644117 is a prime.

It is a super-2 number, since 2×3993644181² = 31898387688870321522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3993644181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3993644111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 657960 + ... + 664001.

It is an arithmetic number, because the mean of its divisors is an integer number (356929740).

Almost surely, 2^3993644181 is an apocalyptic number.

It is an amenable number.

3993644181 is a deficient number, since it is larger than the sum of its proper divisors (1717231659).

3993644181 is a wasteful number, since it uses less digits than its factorization.

3993644181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1322036.

The product of its digits is 559872, while the sum is 48.

The square root of 3993644181 is about 63195.2860662882. The cubic root of 3993644181 is about 1586.5598367792.

The spelling of 3993644181 in words is "three billion, nine hundred ninety-three million, six hundred forty-four thousand, one hundred eighty-one".