135220 has 12 divisors (see below), whose sum is σ = 284004. Its totient is φ = 54080.

The previous prime is 135211. The next prime is 135221. The reversal of 135220 is 22531.

It can be written as a sum of positive squares in 2 ways, for example, as 79524 + 55696 = 282^2 + 236^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 135220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3361 + ... + 3400.

It is an arithmetic number, because the mean of its divisors is an integer number (23667).

2¹³⁵²²⁰ is an apocalyptic number.

135220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

135220 is an abundant number, since it is smaller than the sum of its proper divisors (148784).

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

135220 is a wasteful number, since it uses less digits than its factorization.

135220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6770 (or 6768 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 135220 is about 367.7227216260. The cubic root of 135220 is about 51.3271295514.

Adding to 135220 its reverse (22531), we get a palindrome (157751).

The spelling of 135220 in words is "one hundred thirty-five thousand, two hundred twenty".