1389108405178 has 12 divisors (see below), whose sum is σ = 2256273711918. Its totient is φ = 641126956080.

The previous prime is 1389108405173. The next prime is 1389108405197. The reversal of 1389108405178 is 8715048019831.

It can be written as a sum of positive squares in 3 ways, for example, as 632220585129 + 756887820049 = 795123^2 + 869993^2 .

It is a super-2 number, since 2×1389108405178² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1389108405173) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 2054893753 + ... + 2054894428.

Almost surely, 2^{1389108405178} is an apocalyptic number.

1389108405178 is a deficient number, since it is larger than the sum of its proper divisors (867165306740).

1389108405178 is a wasteful number, since it uses less digits than its factorization.

1389108405178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4109788209 (or 4109788196 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 55.

The spelling of 1389108405178 in words is "one trillion, three hundred eighty-nine billion, one hundred eight million, four hundred five thousand, one hundred seventy-eight".