138791223 has 12 divisors (see below), whose sum is σ = 209192880. Its totient is φ = 88504416.

The previous prime is 138791171. The next prime is 138791249. The reversal of 138791223 is 322197831.

It is not a de Polignac number, because 138791223 - 2⁹ = 138790711 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138791293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 335038 + ... + 335451.

It is an arithmetic number, because the mean of its divisors is an integer number (17432740).

Almost surely, 2^138791223 is an apocalyptic number.

138791223 is a deficient number, since it is larger than the sum of its proper divisors (70401657).

138791223 is a wasteful number, since it uses less digits than its factorization.

138791223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670518 (or 670515 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 138791223 is about 11780.9686783388. The cubic root of 138791223 is about 517.7506676115.

The spelling of 138791223 in words is "one hundred thirty-eight million, seven hundred ninety-one thousand, two hundred twenty-three".