138021673 has 2 divisors, whose sum is σ = 138021674. Its totient is φ = 138021672.

The previous prime is 138021661. The next prime is 138021707. The reversal of 138021673 is 376120831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120824064 + 17197609 = 10992^2 + 4147^2 .

It is an emirp because it is prime and its reverse (376120831) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138021673 is a prime.

It is not a weakly prime, because it can be changed into another prime (138021773) 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, 69010836 + 69010837.

It is an arithmetic number, because the mean of its divisors is an integer number (69010837).

Almost surely, 2^138021673 is an apocalyptic number.

It is an amenable number.

138021673 is a deficient number, since it is larger than the sum of its proper divisors (1).

138021673 is an equidigital number, since it uses as much as digits as its factorization.

138021673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 138021673 is about 11748.2625523947. The cubic root of 138021673 is about 516.7919765889.

The spelling of 138021673 in words is "one hundred thirty-eight million, twenty-one thousand, six hundred seventy-three".