845555 has 4 divisors (see below), whose sum is σ = 1014672. Its totient is φ = 676440.

The previous prime is 845531. The next prime is 845567. The reversal of 845555 is 555548.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 845555 - 2⁶ = 845491 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84551 + ... + 84560.

It is an arithmetic number, because the mean of its divisors is an integer number (253668).

2⁸⁴⁵⁵⁵⁵ is an apocalyptic number.

845555 is a deficient number, since it is larger than the sum of its proper divisors (169117).

845555 is a wasteful number, since it uses less digits than its factorization.

845555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169116.

The product of its digits is 20000, while the sum is 32.

The square root of 845555 is about 919.5406461924. The cubic root of 845555 is about 94.5614131939.

The spelling of 845555 in words is "eight hundred forty-five thousand, five hundred fifty-five".