138435525 has 18 divisors (see below), whose sum is σ = 247953810. Its totient is φ = 73832160.

The previous prime is 138435511. The next prime is 138435529. The reversal of 138435525 is 525534831.

It can be written as a sum of positive squares in 3 ways, for example, as 9771876 + 128663649 = 3126^2 + 11343^2 .

It is not a de Polignac number, because 138435525 - 2⁷ = 138435397 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 138435525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138435529) 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 17 ways as a sum of consecutive naturals, for example, 307410 + ... + 307859.

Almost surely, 2^138435525 is an apocalyptic number.

138435525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138435525 is a deficient number, since it is larger than the sum of its proper divisors (109518285).

138435525 is a wasteful number, since it uses less digits than its factorization.

138435525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615285 (or 615277 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

The square root of 138435525 is about 11765.8626968021. The cubic root of 138435525 is about 517.3079872957.

The spelling of 138435525 in words is "one hundred thirty-eight million, four hundred thirty-five thousand, five hundred twenty-five".