1389121997154 has 16 divisors (see below), whose sum is σ = 2803732472640. Its totient is φ = 458792586000.

The previous prime is 1389121997143. The next prime is 1389121997173. The reversal of 1389121997154 is 4517991219831.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1062019222 + ... + 1062020529.

It is an arithmetic number, because the mean of its divisors is an integer number (175233279540).

Almost surely, 2^{1389121997154} is an apocalyptic number.

1389121997154 is an abundant number, since it is smaller than the sum of its proper divisors (1414610475486).

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

1389121997154 is a wasteful number, since it uses less digits than its factorization.

1389121997154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2124039865.

The product of its digits is 4898880, while the sum is 60.

The spelling of 1389121997154 in words is "one trillion, three hundred eighty-nine billion, one hundred twenty-one million, nine hundred ninety-seven thousand, one hundred fifty-four".