3989556479989 has 2 divisors, whose sum is σ = 3989556479990. Its totient is φ = 3989556479988.

The previous prime is 3989556479971. The next prime is 3989556480001. The reversal of 3989556479989 is 9899746559893.

3989556479989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3436511411089 + 553045068900 = 1853783^2 + 743670^2 .

It is a cyclic number.

It is not a de Polignac number, because 3989556479989 - 2³³ = 3980966545397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3989556479939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1994778239994 + 1994778239995.

It is an arithmetic number, because the mean of its divisors is an integer number (1994778239995).

Almost surely, 2^{3989556479989} is an apocalyptic number.

It is an amenable number.

3989556479989 is a deficient number, since it is larger than the sum of its proper divisors (1).

3989556479989 is an equidigital number, since it uses as much as digits as its factorization.

3989556479989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47617113600, while the sum is 91.

The spelling of 3989556479989 in words is "three trillion, nine hundred eighty-nine billion, five hundred fifty-six million, four hundred seventy-nine thousand, nine hundred eighty-nine".