805556 has 6 divisors (see below), whose sum is σ = 1409730. Its totient is φ = 402776.

The previous prime is 805537. The next prime is 805559. The reversal of 805556 is 655508.

It can be written as a sum of positive squares in only one way, i.e., 792100 + 13456 = 890^2 + 116^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805559) by changing a digit.

805556 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100691 + ... + 100698.

It is an arithmetic number, because the mean of its divisors is an integer number (234955).

2⁸⁰⁵⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

805556 is a deficient number, since it is larger than the sum of its proper divisors (604174).

805556 is a wasteful number, since it uses less digits than its factorization.

805556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201393 (or 201391 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 805556 is about 897.5277154495. The cubic root of 805556 is about 93.0461866396.

The spelling of 805556 in words is "eight hundred five thousand, five hundred fifty-six".