1200128120440 has 64 divisors (see below), whose sum is σ = 2727510912000. Its totient is φ = 475228228608.

The previous prime is 1200128120417. The next prime is 1200128120479. The reversal of 1200128120440 is 440218210021.

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 15 ways as a sum of consecutive naturals, for example, 2063086 + ... + 2580034.

It is an arithmetic number, because the mean of its divisors is an integer number (42617358000).

Almost surely, 2^{1200128120440} is an apocalyptic number.

1200128120440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200128120440 is an abundant number, since it is smaller than the sum of its proper divisors (1527382791560).

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

1200128120440 is a wasteful number, since it uses less digits than its factorization.

1200128120440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517544 (or 517540 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The spelling of 1200128120440 in words is "one trillion, two hundred billion, one hundred twenty-eight million, one hundred twenty thousand, four hundred forty".