555240123 has 16 divisors (see below), whose sum is σ = 841709440. Its totient is φ = 361550952.

The previous prime is 555240121. The next prime is 555240149. The reversal of 555240123 is 321042555.

It is a happy number.

It is not a de Polignac number, because 555240123 - 2¹ = 555240121 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (555240121) by changing a digit.

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, 237961 + ... + 240282.

It is an arithmetic number, because the mean of its divisors is an integer number (52606840).

Almost surely, 2^555240123 is an apocalyptic number.

555240123 is a deficient number, since it is larger than the sum of its proper divisors (286469317).

555240123 is a wasteful number, since it uses less digits than its factorization.

555240123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478295 (or 478289 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 555240123 is about 23563.5337545114. The cubic root of 555240123 is about 821.9150772729.

Adding to 555240123 its reverse (321042555), we get a palindrome (876282678).

The spelling of 555240123 in words is "five hundred fifty-five million, two hundred forty thousand, one hundred twenty-three".