1940205505 has 8 divisors (see below), whose sum is σ = 2660853312. Its totient is φ = 1330426608.

The previous prime is 1940205469. The next prime is 1940205521. The reversal of 1940205505 is 5055020491.

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

It is not a de Polignac number, because 1940205505 - 2¹¹ = 1940203457 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27717187 + ... + 27717256.

It is an arithmetic number, because the mean of its divisors is an integer number (332606664).

Almost surely, 2^1940205505 is an apocalyptic number.

It is an amenable number.

1940205505 is a deficient number, since it is larger than the sum of its proper divisors (720647807).

1940205505 is an equidigital number, since it uses as much as digits as its factorization.

1940205505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55434455.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 1940205505 is about 44047.7639046524. The cubic root of 1940205505 is about 1247.2377415053.

Adding to 1940205505 its reverse (5055020491), we get a palindrome (6995225996).

The spelling of 1940205505 in words is "one billion, nine hundred forty million, two hundred five thousand, five hundred five".