123321605 has 8 divisors (see below), whose sum is σ = 161439264. Its totient is φ = 89688400.

The previous prime is 123321557. The next prime is 123321631. The reversal of 123321605 is 506123321.

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

It is not a de Polignac number, because 123321605 - 2¹⁰ = 123320581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1121051 + ... + 1121160.

It is an arithmetic number, because the mean of its divisors is an integer number (20179908).

Almost surely, 2^123321605 is an apocalyptic number.

It is an amenable number.

123321605 is a deficient number, since it is larger than the sum of its proper divisors (38117659).

123321605 is a wasteful number, since it uses less digits than its factorization.

123321605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2242227.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 123321605 is about 11105.0261143322. The cubic root of 123321605 is about 497.7520485748.

Adding to 123321605 its reverse (506123321), we get a palindrome (629444926).

The spelling of 123321605 in words is "one hundred twenty-three million, three hundred twenty-one thousand, six hundred five".