123378135 has 16 divisors (see below), whose sum is σ = 197618400. Its totient is φ = 65730560.

The previous prime is 123378127. The next prime is 123378139. The reversal of 123378135 is 531873321.

It is not a de Polignac number, because 123378135 - 2³ = 123378127 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123378096 and 123378105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123378139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11815 + ... + 19655.

It is an arithmetic number, because the mean of its divisors is an integer number (12351150).

Almost surely, 2^123378135 is an apocalyptic number.

123378135 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123378135 is a deficient number, since it is larger than the sum of its proper divisors (74240265).

123378135 is a wasteful number, since it uses less digits than its factorization.

123378135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8898.

The product of its digits is 15120, while the sum is 33.

The square root of 123378135 is about 11107.5710666194. The cubic root of 123378135 is about 497.8280926305.

The spelling of 123378135 in words is "one hundred twenty-three million, three hundred seventy-eight thousand, one hundred thirty-five".