135238428 has 144 divisors (see below), whose sum is σ = 395041920. Its totient is φ = 38662272.

The previous prime is 135238423. The next prime is 135238429. The reversal of 135238428 is 824832531.

It is a super-3 number, since 3×135238428³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 135238392 and 135238401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135238421) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 595651 + ... + 595877.

Almost surely, 2^135238428 is an apocalyptic number.

135238428 is a gapful number since it is divisible by the number (18) 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 135238428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197520960).

135238428 is an abundant number, since it is smaller than the sum of its proper divisors (259803492).

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

135238428 is a wasteful number, since it uses less digits than its factorization.

135238428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336 (or 331 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 135238428 is about 11629.2058198314. The cubic root of 135238428 is about 513.2946109357.

The spelling of 135238428 in words is "one hundred thirty-five million, two hundred thirty-eight thousand, four hundred twenty-eight".