138044887 has 2 divisors, whose sum is σ = 138044888. Its totient is φ = 138044886.

The previous prime is 138044833. The next prime is 138044897. The reversal of 138044887 is 788440831.

It is a strong prime.

It is an emirp because it is prime and its reverse (788440831) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138044887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138044897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69022443 + 69022444.

It is an arithmetic number, because the mean of its divisors is an integer number (69022444).

Almost surely, 2^138044887 is an apocalyptic number.

138044887 is a deficient number, since it is larger than the sum of its proper divisors (1).

138044887 is an equidigital number, since it uses as much as digits as its factorization.

138044887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172032, while the sum is 43.

The square root of 138044887 is about 11749.2504867332. The cubic root of 138044887 is about 516.8209482138.

The spelling of 138044887 in words is "one hundred thirty-eight million, forty-four thousand, eight hundred eighty-seven".