3989887555 has 4 divisors (see below), whose sum is σ = 4787865072. Its totient is φ = 3191910040.

The previous prime is 3989887549. The next prime is 3989887589. The reversal of 3989887555 is 5557889893.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5557889893 = 15907 ⋅349399.

It is not a de Polignac number, because 3989887555 - 2³ = 3989887547 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 398988751 + ... + 398988760.

It is an arithmetic number, because the mean of its divisors is an integer number (1196966268).

Almost surely, 2^3989887555 is an apocalyptic number.

3989887555 is a deficient number, since it is larger than the sum of its proper divisors (797977517).

3989887555 is an equidigital number, since it uses as much as digits as its factorization.

3989887555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797977516.

The product of its digits is 108864000, while the sum is 67.

The square root of 3989887555 is about 63165.5567140827. The cubic root of 3989887555 is about 1586.0622142708.

The spelling of 3989887555 in words is "three billion, nine hundred eighty-nine million, eight hundred eighty-seven thousand, five hundred fifty-five".