1819093873 has 4 divisors (see below), whose sum is σ = 1839533220. Its totient is φ = 1798654528.

The previous prime is 1819093849. The next prime is 1819093883. The reversal of 1819093873 is 3783909181.

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 841406049 + 977687824 = 29007^2 + 31268^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1819093873 is a prime.

It is a super-2 number, since 2×1819093873² = 6618205037572280258, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1819093883) 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, 10219540 + ... + 10219717.

It is an arithmetic number, because the mean of its divisors is an integer number (459883305).

Almost surely, 2^1819093873 is an apocalyptic number.

It is an amenable number.

1819093873 is a deficient number, since it is larger than the sum of its proper divisors (20439347).

1819093873 is an equidigital number, since it uses as much as digits as its factorization.

1819093873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20439346.

The product of its (nonzero) digits is 326592, while the sum is 49.

The square root of 1819093873 is about 42650.8367209836. The cubic root of 1819093873 is about 1220.7264939739.

The spelling of 1819093873 in words is "one billion, eight hundred nineteen million, ninety-three thousand, eight hundred seventy-three".