135127220 has 24 divisors (see below), whose sum is σ = 300460104.
Its totient is φ = 50871296.
The previous prime is 135127217. The next prime is 135127243. The reversal of 135127220 is 22721531.
It is a happy number.
It can be written as a sum of positive squares in 4 ways, for example, as 9597604 + 125529616 = 3098^2 + 11204^2
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198377 + ... + 199056.
It is an arithmetic number, because the mean of its divisors is an integer number (12519171).
Almost surely, 2135127220 is an apocalyptic number.
135127220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
135127220 is an abundant number, since it is smaller than the sum of its proper divisors (165332884).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
135127220 is a wasteful number, since it uses less digits than its factorization.
135127220 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 397459 (or 397457 counting only the distinct ones).
The product of its (nonzero) digits is 840, while the sum is 23.
The square root of 135127220 is about 11624.4234265619.
The cubic root of 135127220 is about 513.1538764773.
Adding to 135127220 its reverse (22721531), we get a palindrome (157848751).
The spelling of 135127220 in words is "one hundred thirty-five million, one hundred twenty-seven thousand, two hundred twenty".