123543605 has 16 divisors (see below), whose sum is σ = 158620800. Its totient is φ = 92093760.

The previous prime is 123543571. The next prime is 123543631. The reversal of 123543605 is 506345321.

It is not a de Polignac number, because 123543605 - 2¹⁸ = 123281461 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4865 + ... + 16454.

It is an arithmetic number, because the mean of its divisors is an integer number (9913800).

Almost surely, 2^123543605 is an apocalyptic number.

It is an amenable number.

123543605 is a deficient number, since it is larger than the sum of its proper divisors (35077195).

123543605 is a wasteful number, since it uses less digits than its factorization.

123543605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21404.

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 123543605 is about 11115.0170940039. The cubic root of 123543605 is about 498.0505491610.

Adding to 123543605 its reverse (506345321), we get a palindrome (629888926).

The spelling of 123543605 in words is "one hundred twenty-three million, five hundred forty-three thousand, six hundred five".