1389121505123 has 48 divisors (see below), whose sum is σ = 1588164480000. Its totient is φ = 1204797888000.

The previous prime is 1389121505099. The next prime is 1389121505129. The reversal of 1389121505123 is 3215051219831.

It is not a de Polignac number, because 1389121505123 - 2²⁶ = 1389054396259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1389121505129) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 277877378 + ... + 277882376.

It is an arithmetic number, because the mean of its divisors is an integer number (33086760000).

Almost surely, 2^{1389121505123} is an apocalyptic number.

1389121505123 is a deficient number, since it is larger than the sum of its proper divisors (199042974877).

1389121505123 is a wasteful number, since it uses less digits than its factorization.

1389121505123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5440 (or 5409 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 41.

The spelling of 1389121505123 in words is "one trillion, three hundred eighty-nine billion, one hundred twenty-one million, five hundred five thousand, one hundred twenty-three".