1389121997142 has 64 divisors (see below), whose sum is σ = 3072695109120. Its totient is φ = 415130284800.

The previous prime is 1389121997071. The next prime is 1389121997143. The reversal of 1389121997142 is 2417991219831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389121997143) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71012359 + ... + 71031917.

It is an arithmetic number, because the mean of its divisors is an integer number (48010861080).

Almost surely, 2^{1389121997142} is an apocalyptic number.

1389121997142 is an abundant number, since it is smaller than the sum of its proper divisors (1683573111978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1389121997142 is a wasteful number, since it uses less digits than its factorization.

1389121997142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34389.

The product of its digits is 1959552, while the sum is 57.

The spelling of 1389121997142 in words is "one trillion, three hundred eighty-nine billion, one hundred twenty-one million, nine hundred ninety-seven thousand, one hundred forty-two".