389976381781 has 6 divisors (see below), whose sum is σ = 453645995190. Its totient is φ = 334265470056.

The previous prime is 389976381761. The next prime is 389976381791. The reversal of 389976381781 is 187183679983.

It can be written as a sum of positive squares in only one way, i.e., 315657443556 + 74318938225 = 561834^2 + 272615^2 .

It is not a de Polignac number, because 389976381781 - 2⁹ = 389976381269 is a prime.

It is a super-2 number, since 2×389976381781² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 389976381781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389976381761) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3979350786 + ... + 3979350883.

It is an arithmetic number, because the mean of its divisors is an integer number (75607665865).

Almost surely, 2^389976381781 is an apocalyptic number.

It is an amenable number.

389976381781 is a deficient number, since it is larger than the sum of its proper divisors (63669613409).

389976381781 is an equidigital number, since it uses as much as digits as its factorization.

389976381781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7958701683 (or 7958701676 counting only the distinct ones).

The product of its digits is 109734912, while the sum is 70.

The spelling of 389976381781 in words is "three hundred eighty-nine billion, nine hundred seventy-six million, three hundred eighty-one thousand, seven hundred eighty-one".