138191223 has 4 divisors (see below), whose sum is σ = 184254968. Its totient is φ = 92127480.

The previous prime is 138191167. The next prime is 138191227. The reversal of 138191223 is 322191831.

138191223 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 138191223 - 2⁹ = 138190711 is a prime.

It is a super-2 number, since 2×138191223² = 38193628228471458, 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 (138191227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23031868 + ... + 23031873.

It is an arithmetic number, because the mean of its divisors is an integer number (46063742).

Almost surely, 2^138191223 is an apocalyptic number.

138191223 is a deficient number, since it is larger than the sum of its proper divisors (46063745).

138191223 is an equidigital number, since it uses as much as digits as its factorization.

138191223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46063744.

The product of its digits is 2592, while the sum is 30.

The square root of 138191223 is about 11755.4762983045. The cubic root of 138191223 is about 517.0035042980.

The spelling of 138191223 in words is "one hundred thirty-eight million, one hundred ninety-one thousand, two hundred twenty-three".