138438767 has 2 divisors, whose sum is σ = 138438768. Its totient is φ = 138438766.

The previous prime is 138438757. The next prime is 138438787. The reversal of 138438767 is 767834831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138438767 - 2¹² = 138434671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138438757) 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, 69219383 + 69219384.

It is an arithmetic number, because the mean of its divisors is an integer number (69219384).

Almost surely, 2^138438767 is an apocalyptic number.

138438767 is a deficient number, since it is larger than the sum of its proper divisors (1).

138438767 is an equidigital number, since it uses as much as digits as its factorization.

138438767 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 677376, while the sum is 47.

The square root of 138438767 is about 11766.0004674486. Note that the first 3 decimals coincide. The cubic root of 138438767 is about 517.3120255159.

The spelling of 138438767 in words is "one hundred thirty-eight million, four hundred thirty-eight thousand, seven hundred sixty-seven".