805445 has 8 divisors (see below), whose sum is σ = 990360. Its totient is φ = 628480.

The previous prime is 805421. The next prime is 805451. The reversal of 805445 is 544508.

It can be written as a sum of positive squares in 4 ways, for example, as 20449 + 784996 = 143^2 + 886^2 .

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

It is not a de Polignac number, because 805445 - 2⁶ = 805381 is a prime.

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, 1760 + ... + 2169.

It is an arithmetic number, because the mean of its divisors is an integer number (123795).

2⁸⁰⁵⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

805445 is a deficient number, since it is larger than the sum of its proper divisors (184915).

805445 is a wasteful number, since it uses less digits than its factorization.

805445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3975.

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 805445 is about 897.4658767886. The cubic root of 805445 is about 93.0419127380.

It can be divided in two parts, 80 and 5445, that multiplied together give a square (435600 = 660²).

The spelling of 805445 in words is "eight hundred five thousand, four hundred forty-five".