123105243 has 16 divisors (see below), whose sum is σ = 166079520. Its totient is φ = 81106944.

The previous prime is 123105239. The next prime is 123105263. The reversal of 123105243 is 342501321.

It is not a de Polignac number, because 123105243 - 2² = 123105239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123105233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99553 + ... + 100781.

It is an arithmetic number, because the mean of its divisors is an integer number (10379970).

Almost surely, 2^123105243 is an apocalyptic number.

123105243 is a deficient number, since it is larger than the sum of its proper divisors (42974277).

123105243 is a wasteful number, since it uses less digits than its factorization.

123105243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1598.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 123105243 is about 11095.2802127752. The cubic root of 123105243 is about 497.4607839260.

Adding to 123105243 its reverse (342501321), we get a palindrome (465606564).

The spelling of 123105243 in words is "one hundred twenty-three million, one hundred five thousand, two hundred forty-three".