123705139 has 2 divisors, whose sum is σ = 123705140. Its totient is φ = 123705138.

The previous prime is 123705121. The next prime is 123705157. The reversal of 123705139 is 931507321.

It is a balanced prime because it is at equal distance from previous prime (123705121) and next prime (123705157).

It is an emirp because it is prime and its reverse (931507321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123705139 - 2¹⁵ = 123672371 is a prime.

It is a super-2 number, since 2×123705139² = 30605922830018642, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 123705139.

It is not a weakly prime, because it can be changed into another prime (123705119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61852569 + 61852570.

It is an arithmetic number, because the mean of its divisors is an integer number (61852570).

Almost surely, 2^123705139 is an apocalyptic number.

123705139 is a deficient number, since it is larger than the sum of its proper divisors (1).

123705139 is an equidigital number, since it uses as much as digits as its factorization.

123705139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 123705139 is about 11122.2811958698. The cubic root of 123705139 is about 498.2675226444.

The spelling of 123705139 in words is "one hundred twenty-three million, seven hundred five thousand, one hundred thirty-nine".