805540 has 12 divisors (see below), whose sum is σ = 1691676. Its totient is φ = 322208.

The previous prime is 805537. The next prime is 805559. The reversal of 805540 is 45508.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 553536 + 252004 = 744^2 + 502^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20119 + ... + 20158.

It is an arithmetic number, because the mean of its divisors is an integer number (140973).

2⁸⁰⁵⁵⁴⁰ is an apocalyptic number.

It is an amenable number.

805540 is an abundant number, since it is smaller than the sum of its proper divisors (886136).

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

805540 is a wasteful number, since it uses less digits than its factorization.

805540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40286 (or 40284 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 805540 is about 897.5188020315. The cubic root of 805540 is about 93.0455706059.

The spelling of 805540 in words is "eight hundred five thousand, five hundred forty".