135189520 has 20 divisors (see below), whose sum is σ = 314315820. Its totient is φ = 54075776.

The previous prime is 135189517. The next prime is 135189521. The reversal of 135189520 is 25981531.

It can be written as a sum of positive squares in 2 ways, for example, as 54405376 + 80784144 = 7376^2 + 8988^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (135189521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 844855 + ... + 845014.

It is an arithmetic number, because the mean of its divisors is an integer number (15715791).

Almost surely, 2^135189520 is an apocalyptic number.

135189520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

135189520 is an abundant number, since it is smaller than the sum of its proper divisors (179126300).

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

135189520 is a wasteful number, since it uses less digits than its factorization.

135189520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1689882 (or 1689876 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 34.

The square root of 135189520 is about 11627.1028205654. The cubic root of 135189520 is about 513.2327270465.

The spelling of 135189520 in words is "one hundred thirty-five million, one hundred eighty-nine thousand, five hundred twenty".