135111440 has 20 divisors (see below), whose sum is σ = 314134284. Its totient is φ = 54044544.

The previous prime is 135111439. The next prime is 135111479. The reversal of 135111440 is 44111531.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 88435216 + 46676224 = 9404^2 + 6832^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 844367 + ... + 844526.

Almost surely, 2^135111440 is an apocalyptic number.

135111440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

135111440 is an abundant number, since it is smaller than the sum of its proper divisors (179022844).

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

135111440 is a wasteful number, since it uses less digits than its factorization.

135111440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1688906 (or 1688900 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 135111440 is about 11623.7446634034. The cubic root of 135111440 is about 513.1339005282.

Adding to 135111440 its reverse (44111531), we get a palindrome (179222971).

Subtracting from 135111440 its reverse (44111531), we obtain a palindrome (90999909).

The spelling of 135111440 in words is "one hundred thirty-five million, one hundred eleven thousand, four hundred forty".