1921483728449 has 8 divisors (see below), whose sum is σ = 1983513151488. Its totient is φ = 1859457185280.

The previous prime is 1921483728413. The next prime is 1921483728499. The reversal of 1921483728449 is 9448273841291.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1921483728449 - 2²⁸ = 1921215292993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1921483728391 and 1921483728400.

It is not an unprimeable number, because it can be changed into a prime (1921483728499) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 679184 + ... + 2074670.

It is an arithmetic number, because the mean of its divisors is an integer number (247939143936).

Almost surely, 2^{1921483728449} is an apocalyptic number.

It is an amenable number.

1921483728449 is a deficient number, since it is larger than the sum of its proper divisors (62029423039).

1921483728449 is a wasteful number, since it uses less digits than its factorization.

1921483728449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1439935.

The product of its digits is 27869184, while the sum is 62.

The spelling of 1921483728449 in words is "one trillion, nine hundred twenty-one billion, four hundred eighty-three million, seven hundred twenty-eight thousand, four hundred forty-nine".