805218340 has 24 divisors (see below), whose sum is σ = 1708395192. Its totient is φ = 318766080.

The previous prime is 805218331. The next prime is 805218353. The reversal of 805218340 is 43812508.

It can be written as a sum of positive squares in 4 ways, for example, as 175509504 + 629708836 = 13248^2 + 25094^2 .

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, 205591 + ... + 209470.

It is an arithmetic number, because the mean of its divisors is an integer number (71183133).

Almost surely, 2^805218340 is an apocalyptic number.

It is an amenable number.

805218340 is an abundant number, since it is smaller than the sum of its proper divisors (903176852).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

805218340 is a wasteful number, since it uses less digits than its factorization.

805218340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415167 (or 415165 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 805218340 is about 28376.3693942689. The cubic root of 805218340 is about 930.3318428834.

The spelling of 805218340 in words is "eight hundred five million, two hundred eighteen thousand, three hundred forty".