138212425 has 18 divisors (see below), whose sum is σ = 185586522. Its totient is φ = 102061440.

The previous prime is 138212423. The next prime is 138212471. The reversal of 138212425 is 524212831.

It can be written as a sum of positive squares in 9 ways, for example, as 86415616 + 51796809 = 9296^2 + 7197^2 .

It is not a de Polignac number, because 138212425 - 2¹ = 138212423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138212393 and 138212402.

It is not an unprimeable number, because it can be changed into a prime (138212423) 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 17 ways as a sum of consecutive naturals, for example, 12132 + ... + 20581.

Almost surely, 2^138212425 is an apocalyptic number.

It is an amenable number.

138212425 is a deficient number, since it is larger than the sum of its proper divisors (47374097).

138212425 is a wasteful number, since it uses less digits than its factorization.

138212425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32749 (or 32731 counting only the distinct ones).

The product of its digits is 3840, while the sum is 28.

The square root of 138212425 is about 11756.3780561872. The cubic root of 138212425 is about 517.0299433813.

The spelling of 138212425 in words is "one hundred thirty-eight million, two hundred twelve thousand, four hundred twenty-five".