1820427823 has 4 divisors (see below), whose sum is σ = 1820516008. Its totient is φ = 1820339640.

The previous prime is 1820427799. The next prime is 1820427841. The reversal of 1820427823 is 3287240281.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3287240281 = 13 ⋅252864637.

It is a cyclic number.

It is not a de Polignac number, because 1820427823 - 2⁹ = 1820427311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820427863) 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, 5365 + ... + 60577.

It is an arithmetic number, because the mean of its divisors is an integer number (455129002).

Almost surely, 2^1820427823 is an apocalyptic number.

1820427823 is a deficient number, since it is larger than the sum of its proper divisors (88185).

1820427823 is an equidigital number, since it uses as much as digits as its factorization.

1820427823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88184.

The product of its (nonzero) digits is 43008, while the sum is 37.

The square root of 1820427823 is about 42666.4718836700. The cubic root of 1820427823 is about 1221.0248092062.

The spelling of 1820427823 in words is "one billion, eight hundred twenty million, four hundred twenty-seven thousand, eight hundred twenty-three".