138259025 has 12 divisors (see below), whose sum is σ = 172060044. Its totient is φ = 110208000.

The previous prime is 138259021. The next prime is 138259127. The reversal of 138259025 is 520952831.

It can be written as a sum of positive squares in 6 ways, for example, as 10297681 + 127961344 = 3209^2 + 11312^2 .

It is not a de Polignac number, because 138259025 - 2² = 138259021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138259021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2816 + ... + 16865.

It is an arithmetic number, because the mean of its divisors is an integer number (14338337).

Almost surely, 2^138259025 is an apocalyptic number.

It is an amenable number.

138259025 is a deficient number, since it is larger than the sum of its proper divisors (33801019).

138259025 is a wasteful number, since it uses less digits than its factorization.

138259025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19972 (or 19967 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 138259025 is about 11758.3597920798. The cubic root of 138259025 is about 517.0880444964.

The spelling of 138259025 in words is "one hundred thirty-eight million, two hundred fifty-nine thousand, twenty-five".