138944269 has 4 divisors (see below), whose sum is σ = 139021344. Its totient is φ = 138867196.

The previous prime is 138944257. The next prime is 138944279. The reversal of 138944269 is 962449831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138944269 - 2⁹ = 138943757 is a prime.

It is a super-2 number, since 2×138944269² = 38611019775888722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138944279) 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 3 ways as a sum of consecutive naturals, for example, 35767 + ... + 39460.

It is an arithmetic number, because the mean of its divisors is an integer number (34755336).

Almost surely, 2^138944269 is an apocalyptic number.

It is an amenable number.

138944269 is a deficient number, since it is larger than the sum of its proper divisors (77075).

138944269 is an equidigital number, since it uses as much as digits as its factorization.

138944269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77074.

The product of its digits is 373248, while the sum is 46.

The square root of 138944269 is about 11787.4623647331. The cubic root of 138944269 is about 517.9409067317.

The spelling of 138944269 in words is "one hundred thirty-eight million, nine hundred forty-four thousand, two hundred sixty-nine".