3947855999 has 8 divisors (see below), whose sum is σ = 4121076960. Its totient is φ = 3774766336.

The previous prime is 3947855981. The next prime is 3947856001. The reversal of 3947855999 is 9995587493.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3947855999 - 2²⁸ = 3679420543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3947855909) 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 7 ways as a sum of consecutive naturals, for example, 31319 + ... + 94215.

It is an arithmetic number, because the mean of its divisors is an integer number (515134620).

Almost surely, 2^3947855999 is an apocalyptic number.

3947855999 is a deficient number, since it is larger than the sum of its proper divisors (173220961).

3947855999 is a wasteful number, since it uses less digits than its factorization.

3947855999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65649.

The product of its digits is 110224800, while the sum is 68.

The square root of 3947855999 is about 62831.9663785879. The cubic root of 3947855999 is about 1580.4730729706.

The spelling of 3947855999 in words is "three billion, nine hundred forty-seven million, eight hundred fifty-five thousand, nine hundred ninety-nine".