135143220 has 24 divisors (see below), whose sum is σ = 378401184. Its totient is φ = 36038176.

The previous prime is 135143191. The next prime is 135143227. The reversal of 135143220 is 22341531.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135143227) 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, 1126134 + ... + 1126253.

It is an arithmetic number, because the mean of its divisors is an integer number (15766716).

Almost surely, 2^135143220 is an apocalyptic number.

135143220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

135143220 is an abundant number, since it is smaller than the sum of its proper divisors (243257964).

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

135143220 is a wasteful number, since it uses less digits than its factorization.

135143220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2252399 (or 2252397 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 135143220 is about 11625.1116123674. Note that the first 3 decimals coincide. The cubic root of 135143220 is about 513.1741293372.

Adding to 135143220 its reverse (22341531), we get a palindrome (157484751).

The spelling of 135143220 in words is "one hundred thirty-five million, one hundred forty-three thousand, two hundred twenty".