138725437 has 2 divisors, whose sum is σ = 138725438. Its totient is φ = 138725436.

The previous prime is 138725429. The next prime is 138725497. The reversal of 138725437 is 734527831.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100520676 + 38204761 = 10026^2 + 6181^2 .

It is an emirp because it is prime and its reverse (734527831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138725437 - 2³ = 138725429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138725437.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138725417) 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 as a sum of consecutive naturals, namely, 69362718 + 69362719.

It is an arithmetic number, because the mean of its divisors is an integer number (69362719).

Almost surely, 2^138725437 is an apocalyptic number.

It is an amenable number.

138725437 is a deficient number, since it is larger than the sum of its proper divisors (1).

138725437 is an equidigital number, since it uses as much as digits as its factorization.

138725437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 40.

The square root of 138725437 is about 11778.1763019578. The cubic root of 138725437 is about 517.6688513707.

The spelling of 138725437 in words is "one hundred thirty-eight million, seven hundred twenty-five thousand, four hundred thirty-seven".