123738139 has 16 divisors (see below), whose sum is σ = 143936512. Its totient is φ = 104182848.

The previous prime is 123738113. The next prime is 123738191. The reversal of 123738139 is 931837321.

It is not a de Polignac number, because 123738139 - 2⁷ = 123738011 is a prime.

It is a super-2 number, since 2×123738139² = 30622254086366642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123738098 and 123738107.

It is not an unprimeable number, because it can be changed into a prime (123736139) by changing a digit.

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, 236332 + ... + 236854.

It is an arithmetic number, because the mean of its divisors is an integer number (8996032).

Almost surely, 2^123738139 is an apocalyptic number.

123738139 is a deficient number, since it is larger than the sum of its proper divisors (20198373).

123738139 is an equidigital number, since it uses as much as digits as its factorization.

123738139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066.

The product of its digits is 27216, while the sum is 37.

The square root of 123738139 is about 11123.7646055641. The cubic root of 123738139 is about 498.3118252134.

The spelling of 123738139 in words is "one hundred twenty-three million, seven hundred thirty-eight thousand, one hundred thirty-nine".