1808220085 has 8 divisors (see below), whose sum is σ = 2479844736. Its totient is φ = 1239922320.

The previous prime is 1808220083. The next prime is 1808220103. The reversal of 1808220085 is 5800228081.

It is a happy number.

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

It is not a de Polignac number, because 1808220085 - 2¹ = 1808220083 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 1808220085.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1808220083) 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, 25831681 + ... + 25831750.

It is an arithmetic number, because the mean of its divisors is an integer number (309980592).

Almost surely, 2^1808220085 is an apocalyptic number.

It is an amenable number.

1808220085 is a deficient number, since it is larger than the sum of its proper divisors (671624651).

1808220085 is an equidigital number, since it uses as much as digits as its factorization.

1808220085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51663443.

The product of its (nonzero) digits is 10240, while the sum is 34.

The square root of 1808220085 is about 42523.1711540896. The cubic root of 1808220085 is about 1218.2892992536.

The spelling of 1808220085 in words is "one billion, eight hundred eight million, two hundred twenty thousand, eighty-five".