138332437 has 2 divisors, whose sum is σ = 138332438. Its totient is φ = 138332436.

The previous prime is 138332423. The next prime is 138332479. The reversal of 138332437 is 734233831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99880036 + 38452401 = 9994^2 + 6201^2 .

It is an emirp because it is prime and its reverse (734233831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138332437 - 2¹⁹ = 137808149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138332497) 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 as a sum of consecutive naturals, namely, 69166218 + 69166219.

It is an arithmetic number, because the mean of its divisors is an integer number (69166219).

Almost surely, 2^138332437 is an apocalyptic number.

It is an amenable number.

138332437 is a deficient number, since it is larger than the sum of its proper divisors (1).

138332437 is an equidigital number, since it uses as much as digits as its factorization.

138332437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 34.

The square root of 138332437 is about 11761.4810717018. The cubic root of 138332437 is about 517.1795484708.

The spelling of 138332437 in words is "one hundred thirty-eight million, three hundred thirty-two thousand, four hundred thirty-seven".