123663605 has 8 divisors (see below), whose sum is σ = 159811512. Its totient is φ = 91320768.

The previous prime is 123663581. The next prime is 123663623. The reversal of 123663605 is 506366321.

It can be written as a sum of positive squares in 4 ways, for example, as 21613201 + 102050404 = 4649^2 + 10102^2 .

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 123663605 - 2⁶ = 123663541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 951194 + ... + 951323.

It is an arithmetic number, because the mean of its divisors is an integer number (19976439).

Almost surely, 2^123663605 is an apocalyptic number.

It is an amenable number.

123663605 is a deficient number, since it is larger than the sum of its proper divisors (36147907).

123663605 is a wasteful number, since it uses less digits than its factorization.

123663605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1902535.

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 123663605 is about 11120.4138861825. The cubic root of 123663605 is about 498.2117519626.

The spelling of 123663605 in words is "one hundred twenty-three million, six hundred sixty-three thousand, six hundred five".