135440025 has 24 divisors (see below), whose sum is σ = 255918144. Its totient is φ = 61915200.

The previous prime is 135440009. The next prime is 135440027. The reversal of 135440025 is 520044531.

It is not a de Polignac number, because 135440025 - 2⁴ = 135440009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 135439977 and 135440004.

It is not an unprimeable number, because it can be changed into a prime (135440027) 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 23 ways as a sum of consecutive naturals, for example, 128466 + ... + 129515.

It is an arithmetic number, because the mean of its divisors is an integer number (10663256).

Almost surely, 2^135440025 is an apocalyptic number.

135440025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

135440025 is a deficient number, since it is larger than the sum of its proper divisors (120478119).

135440025 is a wasteful number, since it uses less digits than its factorization.

135440025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258001 (or 257996 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 135440025 is about 11637.8702948607. The cubic root of 135440025 is about 513.5495366989.

Adding to 135440025 its reverse (520044531), we get a palindrome (655484556).

The spelling of 135440025 in words is "one hundred thirty-five million, four hundred forty thousand, twenty-five".