123242555 has 8 divisors (see below), whose sum is σ = 148154400. Its totient is φ = 98418496.

The previous prime is 123242549. The next prime is 123242617. The reversal of 123242555 is 555242321.

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 123242555 - 2¹² = 123238459 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 18815 + ... + 24504.

It is an arithmetic number, because the mean of its divisors is an integer number (18519300).

Almost surely, 2^123242555 is an apocalyptic number.

123242555 is a deficient number, since it is larger than the sum of its proper divisors (24911845).

123242555 is an equidigital number, since it uses as much as digits as its factorization.

123242555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43893.

The product of its digits is 12000, while the sum is 29.

The square root of 123242555 is about 11101.4663445871. The cubic root of 123242555 is about 497.6456716759.

Adding to 123242555 its reverse (555242321), we get a palindrome (678484876).

The spelling of 123242555 in words is "one hundred twenty-three million, two hundred forty-two thousand, five hundred fifty-five".