3981989907284 has 6 divisors (see below), whose sum is σ = 6968482337754. Its totient is φ = 1990994953640.

The previous prime is 3981989907227. The next prime is 3981989907317. The reversal of 3981989907284 is 4827099891893.

It can be written as a sum of positive squares in only one way, i.e., 3911605817284 + 70384090000 = 1977778^2 + 265300^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497748738407 + ... + 497748738414.

It is an arithmetic number, because the mean of its divisors is an integer number (1161413722959).

Almost surely, 2^{3981989907284} is an apocalyptic number.

It is an amenable number.

3981989907284 is a deficient number, since it is larger than the sum of its proper divisors (2986492430470).

3981989907284 is a wasteful number, since it uses less digits than its factorization.

3981989907284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 995497476825 (or 995497476823 counting only the distinct ones).

The product of its (nonzero) digits is 564350976, while the sum is 77.

The spelling of 3981989907284 in words is "three trillion, nine hundred eighty-one billion, nine hundred eighty-nine million, nine hundred seven thousand, two hundred eighty-four".