123138673 has 4 divisors (see below), whose sum is σ = 140729920. Its totient is φ = 105547428.

The previous prime is 123138661. The next prime is 123138683. The reversal of 123138673 is 376831321.

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 not a de Polignac number, because 123138673 - 2⁵ = 123138641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123138683) 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, 8795613 + ... + 8795626.

It is an arithmetic number, because the mean of its divisors is an integer number (35182480).

Almost surely, 2^123138673 is an apocalyptic number.

It is an amenable number.

123138673 is a deficient number, since it is larger than the sum of its proper divisors (17591247).

123138673 is an equidigital number, since it uses as much as digits as its factorization.

123138673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17591246.

The product of its digits is 18144, while the sum is 34.

The square root of 123138673 is about 11096.7866069417. The cubic root of 123138673 is about 497.5058093814.

Adding to 123138673 its reverse (376831321), we get a palindrome (499969994).

The spelling of 123138673 in words is "one hundred twenty-three million, one hundred thirty-eight thousand, six hundred seventy-three".