138712237 has 2 divisors, whose sum is σ = 138712238. Its totient is φ = 138712236.

The previous prime is 138712207. The next prime is 138712243. The reversal of 138712237 is 732217831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74407876 + 64304361 = 8626^2 + 8019^2 .

It is a cyclic number.

It is not a de Polignac number, because 138712237 - 2¹⁹ = 138187949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138712207) 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, 69356118 + 69356119.

It is an arithmetic number, because the mean of its divisors is an integer number (69356119).

Almost surely, 2^138712237 is an apocalyptic number.

It is an amenable number.

138712237 is a deficient number, since it is larger than the sum of its proper divisors (1).

138712237 is an equidigital number, since it uses as much as digits as its factorization.

138712237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 34.

The square root of 138712237 is about 11777.6159302297. The cubic root of 138712237 is about 517.6524317779.

The spelling of 138712237 in words is "one hundred thirty-eight million, seven hundred twelve thousand, two hundred thirty-seven".