2805538405 has 8 divisors (see below), whose sum is σ = 3386107512. Its totient is φ = 2231456448.

The previous prime is 2805538399. The next prime is 2805538427. The reversal of 2805538405 is 5048355082.

It can be written as a sum of positive squares in 4 ways, for example, as 632673409 + 2172864996 = 25153^2 + 46614^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2805538405 - 2⁹ = 2805537893 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 (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1620834 + ... + 1622563.

It is an arithmetic number, because the mean of its divisors is an integer number (423263439).

Almost surely, 2^2805538405 is an apocalyptic number.

It is an amenable number.

2805538405 is a deficient number, since it is larger than the sum of its proper divisors (580569107).

2805538405 is a wasteful number, since it uses less digits than its factorization.

2805538405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3243575.

The product of its (nonzero) digits is 192000, while the sum is 40.

The square root of 2805538405 is about 52967.3333763368. Note that the first 4 decimals coincide. The cubic root of 2805538405 is about 1410.3884389951.

The spelling of 2805538405 in words is "two billion, eight hundred five million, five hundred thirty-eight thousand, four hundred five".