1813426273 has 4 divisors (see below), whose sum is σ = 1813622980. Its totient is φ = 1813229568.

The previous prime is 1813426271. The next prime is 1813426297. The reversal of 1813426273 is 3726243181.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3726243181 = 157 ⋅23734033.

It can be written as a sum of positive squares in 2 ways, for example, as 798175504 + 1015250769 = 28252^2 + 31863^2 .

It is a cyclic number.

It is not a de Polignac number, because 1813426273 - 2¹ = 1813426271 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1813426271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83808 + ... + 103201.

It is an arithmetic number, because the mean of its divisors is an integer number (453405745).

Almost surely, 2^1813426273 is an apocalyptic number.

It is an amenable number.

1813426273 is a deficient number, since it is larger than the sum of its proper divisors (196707).

1813426273 is an equidigital number, since it uses as much as digits as its factorization.

1813426273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196706.

The product of its digits is 48384, while the sum is 37.

The square root of 1813426273 is about 42584.3430499990. The cubic root of 1813426273 is about 1219.4574029413.

The spelling of 1813426273 in words is "one billion, eight hundred thirteen million, four hundred twenty-six thousand, two hundred seventy-three".