1928409365873 has 4 divisors (see below), whose sum is σ = 1960022634228. Its totient is φ = 1896796097520.

The previous prime is 1928409365851. The next prime is 1928409365947. The reversal of 1928409365873 is 3785639048291.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 751633513024 + 1176775852849 = 866968^2 + 1084793^2 .

It is a cyclic number.

It is not a de Polignac number, because 1928409365873 - 2⁶ = 1928409365809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1928409365843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15806634086 + ... + 15806634207.

It is an arithmetic number, because the mean of its divisors is an integer number (490005658557).

It is a 1-persistent number, because it is pandigital, but 2⋅1928409365873 = 3856818731746 is not.

Almost surely, 2^{1928409365873} is an apocalyptic number.

It is an amenable number.

1928409365873 is a deficient number, since it is larger than the sum of its proper divisors (31613268355).

1928409365873 is an equidigital number, since it uses as much as digits as its factorization.

1928409365873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31613268354.

The product of its (nonzero) digits is 78382080, while the sum is 65.

The spelling of 1928409365873 in words is "one trillion, nine hundred twenty-eight billion, four hundred nine million, three hundred sixty-five thousand, eight hundred seventy-three".