805780849 has 8 divisors (see below), whose sum is σ = 818893152. Its totient is φ = 792749760.

The previous prime is 805780819. The next prime is 805780901. The reversal of 805780849 is 948087508.

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 805780849 - 2¹⁵ = 805748081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (805780819) 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, 139 + ... + 40144.

It is an arithmetic number, because the mean of its divisors is an integer number (102361644).

Almost surely, 2^805780849 is an apocalyptic number.

It is an amenable number.

805780849 is a deficient number, since it is larger than the sum of its proper divisors (13112303).

805780849 is a wasteful number, since it uses less digits than its factorization.

805780849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40607.

The product of its (nonzero) digits is 645120, while the sum is 49.

The square root of 805780849 is about 28386.2792383926. The cubic root of 805780849 is about 930.5484293650.

The spelling of 805780849 in words is "eight hundred five million, seven hundred eighty thousand, eight hundred forty-nine".