123405505 has 16 divisors (see below), whose sum is σ = 151027200. Its totient is φ = 96782400.

The previous prime is 123405497. The next prime is 123405509. The reversal of 123405505 is 505504321.

It is not a de Polignac number, because 123405505 - 2³ = 123405497 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123405505.

It is not an unprimeable number, because it can be changed into a prime (123405509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58611 + ... + 60679.

It is an arithmetic number, because the mean of its divisors is an integer number (9439200).

Almost surely, 2^123405505 is an apocalyptic number.

It is an amenable number.

123405505 is a deficient number, since it is larger than the sum of its proper divisors (27621695).

123405505 is a wasteful number, since it uses less digits than its factorization.

123405505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2304.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 123405505 is about 11108.8030408321. The cubic root of 123405505 is about 497.8649023603.

Adding to 123405505 its reverse (505504321), we get a palindrome (628909826).

The spelling of 123405505 in words is "one hundred twenty-three million, four hundred five thousand, five hundred five".