3981989907285 has 16 divisors (see below), whose sum is σ = 6861274917504. Its totient is φ = 1960364261952.

The previous prime is 3981989907227. The next prime is 3981989907317. The reversal of 3981989907285 is 5827099891893.

It is not a de Polignac number, because 3981989907285 - 2⁸ = 3981989907029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3981989907285.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 10210230337 + ... + 10210230726.

It is an arithmetic number, because the mean of its divisors is an integer number (428829682344).

Almost surely, 2^{3981989907285} is an apocalyptic number.

It is an amenable number.

3981989907285 is a deficient number, since it is larger than the sum of its proper divisors (2879285010219).

3981989907285 is a wasteful number, since it uses less digits than its factorization.

3981989907285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20420461084.

The product of its (nonzero) digits is 705438720, while the sum is 78.

The spelling of 3981989907285 in words is "three trillion, nine hundred eighty-one billion, nine hundred eighty-nine million, nine hundred seven thousand, two hundred eighty-five".