135955920 has 80 divisors (see below), whose sum is σ = 422597952. Its totient is φ = 36157440.

The previous prime is 135955903. The next prime is 135955943. The reversal of 135955920 is 29559531.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153880 + ... + 154760.

Almost surely, 2^135955920 is an apocalyptic number.

135955920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 135955920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211298976).

135955920 is an abundant number, since it is smaller than the sum of its proper divisors (286642032).

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

135955920 is a wasteful number, since it uses less digits than its factorization.

135955920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1540 (or 1534 counting only the distinct ones).

The product of its (nonzero) digits is 60750, while the sum is 39.

The square root of 135955920 is about 11660.0137221189. The cubic root of 135955920 is about 514.2007522787.

The spelling of 135955920 in words is "one hundred thirty-five million, nine hundred fifty-five thousand, nine hundred twenty".