805645 has 8 divisors (see below), whose sum is σ = 983520. Its totient is φ = 633360.

The previous prime is 805639. The next prime is 805687. The reversal of 805645 is 546508.

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

It is not a de Polignac number, because 805645 - 2⁷ = 805517 is a prime.

It is a super-3 number, since 3×805645³ = 1568745175031133375, which contains 333 as substring.

805645 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1071 + ... + 1660.

It is an arithmetic number, because the mean of its divisors is an integer number (122940).

2⁸⁰⁵⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

805645 is a deficient number, since it is larger than the sum of its proper divisors (177875).

805645 is a wasteful number, since it uses less digits than its factorization.

805645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2795.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 805645 is about 897.5772947217. The cubic root of 805645 is about 93.0496131780.

The spelling of 805645 in words is "eight hundred five thousand, six hundred forty-five".