123043505 has 8 divisors (see below), whose sum is σ = 159010152. Its totient is φ = 90862848.

The previous prime is 123043499. The next prime is 123043507. The reversal of 123043505 is 505340321.

It can be written as a sum of positive squares in 4 ways, for example, as 7974976 + 115068529 = 2824^2 + 10727^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 123043505 - 2¹⁶ = 122977969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123043507) by changing a digit.

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, 946424 + ... + 946553.

It is an arithmetic number, because the mean of its divisors is an integer number (19876269).

Almost surely, 2^123043505 is an apocalyptic number.

It is an amenable number.

123043505 is a deficient number, since it is larger than the sum of its proper divisors (35966647).

123043505 is a wasteful number, since it uses less digits than its factorization.

123043505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1892995.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 123043505 is about 11092.4976898803. The cubic root of 123043505 is about 497.3776101887.

Adding to 123043505 its reverse (505340321), we get a palindrome (628383826).

The spelling of 123043505 in words is "one hundred twenty-three million, forty-three thousand, five hundred five".