1920394281544 has 8 divisors (see below), whose sum is σ = 3600739277910. Its totient is φ = 960197140768.

The previous prime is 1920394281523. The next prime is 1920394281599. The reversal of 1920394281544 is 4451824930291.

It can be written as a sum of positive squares in only one way, i.e., 1478485764900 + 441908516644 = 1215930^2 + 664762^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 1920394281491 and 1920394281500.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120024642589 + ... + 120024642604.

Almost surely, 2^{1920394281544} is an apocalyptic number.

It is an amenable number.

1920394281544 is a deficient number, since it is larger than the sum of its proper divisors (1680344996366).

1920394281544 is a wasteful number, since it uses less digits than its factorization.

1920394281544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240049285199 (or 240049285195 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 52.

The spelling of 1920394281544 in words is "one trillion, nine hundred twenty billion, three hundred ninety-four million, two hundred eighty-one thousand, five hundred forty-four".