805240 has 32 divisors (see below), whose sum is σ = 1859760. Its totient is φ = 313600.

The previous prime is 805223. The next prime is 805241. The reversal of 805240 is 42508.

It is a happy number.

It is a super-2 number, since 2×805240² = 1296822915200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1395 + ... + 1885.

2⁸⁰⁵²⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 805240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (929880).

805240 is an abundant number, since it is smaller than the sum of its proper divisors (1054520).

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

805240 is a wasteful number, since it uses less digits than its factorization.

805240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543 (or 539 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 805240 is about 897.3516590501. The cubic root of 805240 is about 93.0340184640.

Adding to 805240 its reverse (42508), we get a palindrome (847748).

The spelling of 805240 in words is "eight hundred five thousand, two hundred forty".