135439025 has 12 divisors (see below), whose sum is σ = 168572544. Its totient is φ = 107946000.

The previous prime is 135439021. The next prime is 135439037. The reversal of 135439025 is 520934531.

It is not a de Polignac number, because 135439025 - 2² = 135439021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 135438982 and 135439000.

It is not an unprimeable number, because it can be changed into a prime (135439021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3221 + ... + 16770.

It is an arithmetic number, because the mean of its divisors is an integer number (14047712).

Almost surely, 2^135439025 is an apocalyptic number.

It is an amenable number.

135439025 is a deficient number, since it is larger than the sum of its proper divisors (33133519).

135439025 is a wasteful number, since it uses less digits than its factorization.

135439025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20272 (or 20267 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 135439025 is about 11637.8273315942. The cubic root of 135439025 is about 513.5482727919.

The spelling of 135439025 in words is "one hundred thirty-five million, four hundred thirty-nine thousand, twenty-five".