123634139 has 2 divisors, whose sum is σ = 123634140. Its totient is φ = 123634138.

The previous prime is 123634079. The next prime is 123634141. The reversal of 123634139 is 931436321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123634139 - 2¹⁶ = 123568603 is a prime.

It is a Sophie Germain prime.

Together with 123634141, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (123624139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61817069 + 61817070.

It is an arithmetic number, because the mean of its divisors is an integer number (61817070).

Almost surely, 2^123634139 is an apocalyptic number.

123634139 is a deficient number, since it is larger than the sum of its proper divisors (1).

123634139 is an equidigital number, since it uses as much as digits as its factorization.

123634139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 32.

The square root of 123634139 is about 11119.0889464920. The cubic root of 123634139 is about 498.1721782777.

The spelling of 123634139 in words is "one hundred twenty-three million, six hundred thirty-four thousand, one hundred thirty-nine".