123405135 has 32 divisors (see below), whose sum is σ = 229366272. Its totient is φ = 55486080.

The previous prime is 123405083. The next prime is 123405157. The reversal of 123405135 is 531504321.

It is not a de Polignac number, because 123405135 - 2⁹ = 123404623 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3229 + ... + 16038.

It is an arithmetic number, because the mean of its divisors is an integer number (7167696).

Almost surely, 2^123405135 is an apocalyptic number.

123405135 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123405135 is a deficient number, since it is larger than the sum of its proper divisors (105961137).

123405135 is a wasteful number, since it uses less digits than its factorization.

123405135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19343.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 123405135 is about 11108.7863873602. The cubic root of 123405135 is about 497.8644047861.

Adding to 123405135 its reverse (531504321), we get a palindrome (654909456).

The spelling of 123405135 in words is "one hundred twenty-three million, four hundred five thousand, one hundred thirty-five".