509822 has 4 divisors (see below), whose sum is σ = 764736. Its totient is φ = 254910.

The previous prime is 509801. The next prime is 509833. The reversal of 509822 is 228905.

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

It is a junction number, because it is equal to n+sod(n) for n = 509791 and 509800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127454 + ... + 127457.

It is an arithmetic number, because the mean of its divisors is an integer number (191184).

2⁵⁰⁹⁸²² is an apocalyptic number.

509822 is a deficient number, since it is larger than the sum of its proper divisors (254914).

509822 is a wasteful number, since it uses less digits than its factorization.

509822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254913.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 509822 is about 714.0182070508. The cubic root of 509822 is about 79.8864012680.

Subtracting from 509822 its sum of digits (26), we obtain a square (509796 = 714²).

It can be divided in two parts, 509 and 822, that added together give a palindrome (1331).

The spelling of 509822 in words is "five hundred nine thousand, eight hundred twenty-two".