135868540 has 24 divisors (see below), whose sum is σ = 291396672. Its totient is φ = 53190720.

The previous prime is 135868531. The next prime is 135868541. The reversal of 135868540 is 45868531.

It is a junction number, because it is equal to n+sod(n) for n = 135868493 and 135868502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135868541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71331 + ... + 73210.

It is an arithmetic number, because the mean of its divisors is an integer number (12141528).

Almost surely, 2^135868540 is an apocalyptic number.

135868540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

135868540 is an abundant number, since it is smaller than the sum of its proper divisors (155528132).

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

135868540 is a wasteful number, since it uses less digits than its factorization.

135868540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144597 (or 144595 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 40.

The square root of 135868540 is about 11656.2661259942. The cubic root of 135868540 is about 514.0905683039.

Subtracting from 135868540 its reverse (45868531), we obtain a palindrome (90000009).

The spelling of 135868540 in words is "one hundred thirty-five million, eight hundred sixty-eight thousand, five hundred forty".