201840005 has 4 divisors (see below), whose sum is σ = 242208012. Its totient is φ = 161472000.

The previous prime is 201839999. The next prime is 201840013. The reversal of 201840005 is 500048102.

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 72199009 + 129640996 = 8497^2 + 11386^2 .

It is not a de Polignac number, because 201840005 - 2⁸ = 201839749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20183996 + ... + 20184005.

It is an arithmetic number, because the mean of its divisors is an integer number (60552003).

Almost surely, 2^201840005 is an apocalyptic number.

It is an amenable number.

201840005 is a deficient number, since it is larger than the sum of its proper divisors (40368007).

201840005 is an equidigital number, since it uses as much as digits as its factorization.

201840005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40368006.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 201840005 is about 14207.0406841115. The cubic root of 201840005 is about 586.5914782185.

Adding to 201840005 its reverse (500048102), we get a palindrome (701888107).

The spelling of 201840005 in words is "two hundred one million, eight hundred forty thousand, five".