188805005 has 4 divisors (see below), whose sum is σ = 226566012. Its totient is φ = 151044000.

The previous prime is 188804963. The next prime is 188805013. The reversal of 188805005 is 500508881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 500508881 = 179 ⋅2796139.

It can be written as a sum of positive squares in 2 ways, for example, as 71537764 + 117267241 = 8458^2 + 10829^2 .

It is a de Polignac number, because none of the positive numbers 2^k-188805005 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18880496 + ... + 18880505.

It is an arithmetic number, because the mean of its divisors is an integer number (56641503).

Almost surely, 2^188805005 is an apocalyptic number.

It is an amenable number.

188805005 is a deficient number, since it is larger than the sum of its proper divisors (37761007).

188805005 is an equidigital number, since it uses as much as digits as its factorization.

188805005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37761006.

The product of its (nonzero) digits is 12800, while the sum is 35.

The square root of 188805005 is about 13740.6333551260. The cubic root of 188805005 is about 573.6819260641.

The spelling of 188805005 in words is "one hundred eighty-eight million, eight hundred five thousand, five".