1820928457273 has 4 divisors (see below), whose sum is σ = 1870142739940. Its totient is φ = 1771714174608.

The previous prime is 1820928457141. The next prime is 1820928457279. The reversal of 1820928457273 is 3727548290281.

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 996377286969 + 824551170304 = 998187^2 + 908048^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1820928457273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1820928457279) 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, 24607141278 + ... + 24607141351.

It is an arithmetic number, because the mean of its divisors is an integer number (467535684985).

Almost surely, 2^{1820928457273} is an apocalyptic number.

It is an amenable number.

1820928457273 is a deficient number, since it is larger than the sum of its proper divisors (49214282667).

1820928457273 is an equidigital number, since it uses as much as digits as its factorization.

1820928457273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49214282666.

The product of its (nonzero) digits is 13547520, while the sum is 58.

The spelling of 1820928457273 in words is "one trillion, eight hundred twenty billion, nine hundred twenty-eight million, four hundred fifty-seven thousand, two hundred seventy-three".