135500240 has 20 divisors (see below), whose sum is σ = 315038244. Its totient is φ = 54200064.

The previous prime is 135500231. The next prime is 135500269. The reversal of 135500240 is 42005531.

It can be written as a sum of positive squares in 2 ways, for example, as 95101504 + 40398736 = 9752^2 + 6356^2 .

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 a congruent number.

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, 846797 + ... + 846956.

Almost surely, 2^135500240 is an apocalyptic number.

135500240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

135500240 is an abundant number, since it is smaller than the sum of its proper divisors (179538004).

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

135500240 is a wasteful number, since it uses less digits than its factorization.

135500240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1693766 (or 1693760 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 135500240 is about 11640.4570357010. The cubic root of 135500240 is about 513.6256313978.

Adding to 135500240 its reverse (42005531), we get a palindrome (177505771).

The spelling of 135500240 in words is "one hundred thirty-five million, five hundred thousand, two hundred forty".