135021816 has 40 divisors (see below), whose sum is σ = 378187920. Its totient is φ = 45007056.

The previous prime is 135021797. The next prime is 135021841. The reversal of 135021816 is 618120531.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 135021816.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 103536 + ... + 104831.

It is an arithmetic number, because the mean of its divisors is an integer number (9454698).

Almost surely, 2^135021816 is an apocalyptic number.

It is an amenable number.

135021816 is an abundant number, since it is smaller than the sum of its proper divisors (243166104).

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

135021816 is a wasteful number, since it uses less digits than its factorization.

135021816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208385 (or 208372 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 135021816 is about 11619.8888118605. Note that the first 4 decimals coincide. The cubic root of 135021816 is about 513.0204157259.

The spelling of 135021816 in words is "one hundred thirty-five million, twenty-one thousand, eight hundred sixteen".