1909115445440 has 112 divisors (see below), whose sum is σ = 5196509377344. Its totient is φ = 654429388800.

The previous prime is 1909115445439. The next prime is 1909115445481. The reversal of 1909115445440 is 445445119091.

It is a tau number, because it is divible by the number of its divisors (112).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12109520 + ... + 12266160.

Almost surely, 2^{1909115445440} is an apocalyptic number.

1909115445440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1909115445440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2598254688672).

1909115445440 is an abundant number, since it is smaller than the sum of its proper divisors (3287393931904).

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

1909115445440 is a wasteful number, since it uses less digits than its factorization.

1909115445440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162106 (or 162096 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 47.

The spelling of 1909115445440 in words is "one trillion, nine hundred nine billion, one hundred fifteen million, four hundred forty-five thousand, four hundred forty".