123838505 has 16 divisors (see below), whose sum is σ = 170069760. Its totient is φ = 84800832.

The previous prime is 123838499. The next prime is 123838511. The reversal of 123838505 is 505838321.

It is an interprime number because it is at equal distance from previous prime (123838499) and next prime (123838511).

It is a cyclic number.

It is not a de Polignac number, because 123838505 - 2¹⁰ = 123837481 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29051 + ... + 33039.

It is an arithmetic number, because the mean of its divisors is an integer number (10629360).

Almost surely, 2^123838505 is an apocalyptic number.

It is an amenable number.

123838505 is a deficient number, since it is larger than the sum of its proper divisors (46231255).

123838505 is an equidigital number, since it uses as much as digits as its factorization.

123838505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4888.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 123838505 is about 11128.2750235605. The cubic root of 123838505 is about 498.4465183885.

The spelling of 123838505 in words is "one hundred twenty-three million, eight hundred thirty-eight thousand, five hundred five".