123205145 has 8 divisors (see below), whose sum is σ = 168967104. Its totient is φ = 84483504.

The previous prime is 123205133. The next prime is 123205211. The reversal of 123205145 is 541502321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 123205145 - 2²⁰ = 122156569 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123205145.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1760039 + ... + 1760108.

It is an arithmetic number, because the mean of its divisors is an integer number (21120888).

Almost surely, 2^123205145 is an apocalyptic number.

It is an amenable number.

123205145 is a deficient number, since it is larger than the sum of its proper divisors (45761959).

123205145 is an equidigital number, since it uses as much as digits as its factorization.

123205145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3520159.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 123205145 is about 11099.7813041519. The cubic root of 123205145 is about 497.5953135059.

Adding to 123205145 its reverse (541502321), we get a palindrome (664707466).

The spelling of 123205145 in words is "one hundred twenty-three million, two hundred five thousand, one hundred forty-five".