1820639023 has 8 divisors (see below), whose sum is σ = 2083246880. Its totient is φ = 1558660320.

The previous prime is 1820639017. The next prime is 1820639069. The reversal of 1820639023 is 3209360281.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1820639023 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1820639023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820639323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151068 + ... + 162673.

It is an arithmetic number, because the mean of its divisors is an integer number (260405860).

Almost surely, 2^1820639023 is an apocalyptic number.

1820639023 is a deficient number, since it is larger than the sum of its proper divisors (262607857).

1820639023 is an equidigital number, since it uses as much as digits as its factorization.

1820639023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314577.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 1820639023 is about 42668.9468231875. The cubic root of 1820639023 is about 1221.0720271302.

The spelling of 1820639023 in words is "one billion, eight hundred twenty million, six hundred thirty-nine thousand, twenty-three".