853540 has 12 divisors (see below), whose sum is σ = 1792476. Its totient is φ = 341408.

The previous prime is 853529. The next prime is 853543. The reversal of 853540 is 45358.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 401956 + 451584 = 634^2 + 672^2 .

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (853543) by changing a digit.

853540 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21319 + ... + 21358.

It is an arithmetic number, because the mean of its divisors is an integer number (149373).

2⁸⁵³⁵⁴⁰ is an apocalyptic number.

It is an amenable number.

853540 is an abundant number, since it is smaller than the sum of its proper divisors (938936).

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

853540 is a wasteful number, since it uses less digits than its factorization.

853540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42686 (or 42684 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 853540 is about 923.8722855460. The cubic root of 853540 is about 94.8581447025.

Adding to 853540 its reverse (45358), we get a palindrome (898898).

The spelling of 853540 in words is "eight hundred fifty-three thousand, five hundred forty".