138944267 has 16 divisors (see below), whose sum is σ = 176919552. Its totient is φ = 105961920.

The previous prime is 138944257. The next prime is 138944279. The reversal of 138944267 is 762449831.

It is a cyclic number.

It is not a de Polignac number, because 138944267 - 2¹⁰ = 138943243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138944257) 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 in 15 ways as a sum of consecutive naturals, for example, 15578 + ... + 22815.

It is an arithmetic number, because the mean of its divisors is an integer number (11057472).

Almost surely, 2^138944267 is an apocalyptic number.

138944267 is a deficient number, since it is larger than the sum of its proper divisors (37975285).

138944267 is a wasteful number, since it uses less digits than its factorization.

138944267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38458.

The product of its digits is 290304, while the sum is 44.

The square root of 138944267 is about 11787.4622798972. The cubic root of 138944267 is about 517.9409042466.

The spelling of 138944267 in words is "one hundred thirty-eight million, nine hundred forty-four thousand, two hundred sixty-seven".