1820027273 has 4 divisors (see below), whose sum is σ = 1821302340. Its totient is φ = 1818752208.

The previous prime is 1820027263. The next prime is 1820027281. The reversal of 1820027273 is 3727200281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3727200281 = 7 ⋅532457183.

It can be written as a sum of positive squares in 2 ways, for example, as 50310649 + 1769716624 = 7093^2 + 42068^2 .

It is a cyclic number.

It is not a de Polignac number, because 1820027273 - 2⁴ = 1820027257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1820027243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 635390 + ... + 638247.

It is an arithmetic number, because the mean of its divisors is an integer number (455325585).

Almost surely, 2^1820027273 is an apocalyptic number.

It is an amenable number.

1820027273 is a deficient number, since it is larger than the sum of its proper divisors (1275067).

1820027273 is a wasteful number, since it uses less digits than its factorization.

1820027273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275066.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 1820027273 is about 42661.7776586958. Note that the first 3 decimals coincide. The cubic root of 1820027273 is about 1220.9352483245.

The spelling of 1820027273 in words is "one billion, eight hundred twenty million, twenty-seven thousand, two hundred seventy-three".