135204240 has 40 divisors (see below), whose sum is σ = 419133888. Its totient is φ = 36054400.

The previous prime is 135204229. The next prime is 135204241. The reversal of 135204240 is 42402531.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135204241) 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, 281436 + ... + 281915.

Almost surely, 2^135204240 is an apocalyptic number.

135204240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

135204240 is an abundant number, since it is smaller than the sum of its proper divisors (283929648).

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

135204240 is a wasteful number, since it uses less digits than its factorization.

135204240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563367 (or 563361 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 135204240 is about 11627.7358071122. The cubic root of 135204240 is about 513.2513540119.

Adding to 135204240 its reverse (42402531), we get a palindrome (177606771).

The spelling of 135204240 in words is "one hundred thirty-five million, two hundred four thousand, two hundred forty".