1389251378068 has 12 divisors (see below), whose sum is σ = 2434040081620. Its totient is φ = 693811354752.

The previous prime is 1389251378059. The next prime is 1389251378101. The reversal of 1389251378068 is 8608731529831.

It can be written as a sum of positive squares in 2 ways, for example, as 51185442564 + 1338065935504 = 226242^2 + 1156748^2 .

It is a hoax number, since the sum of its digits (61) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1389251377997 and 1389251378015.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203579733 + ... + 203586556.

Almost surely, 2^{1389251378068} is an apocalyptic number.

It is an amenable number.

1389251378068 is a deficient number, since it is larger than the sum of its proper divisors (1044788703552).

1389251378068 is a wasteful number, since it uses less digits than its factorization.

1389251378068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407167146 (or 407167144 counting only the distinct ones).

The product of its (nonzero) digits is 17418240, while the sum is 61.

The spelling of 1389251378068 in words is "one trillion, three hundred eighty-nine billion, two hundred fifty-one million, three hundred seventy-eight thousand, sixty-eight".