123142305 has 96 divisors (see below), whose sum is σ = 247750272. Its totient is φ = 51701760.

The previous prime is 123142301. The next prime is 123142307. The reversal of 123142305 is 503241321.

It is not a de Polignac number, because 123142305 - 2² = 123142301 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (123142301) 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 95 ways as a sum of consecutive naturals, for example, 400962 + ... + 401268.

It is an arithmetic number, because the mean of its divisors is an integer number (2580732).

Almost surely, 2^123142305 is an apocalyptic number.

123142305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123142305 is an abundant number, since it is smaller than the sum of its proper divisors (124607967).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123142305 is a wasteful number, since it uses less digits than its factorization.

123142305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367 (or 356 counting only the distinct ones).

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

The square root of 123142305 is about 11096.9502567147. The cubic root of 123142305 is about 497.5107006781.

Adding to 123142305 its reverse (503241321), we get a palindrome (626383626).

The spelling of 123142305 in words is "one hundred twenty-three million, one hundred forty-two thousand, three hundred five".