123400420139 has 2 divisors, whose sum is σ = 123400420140. Its totient is φ = 123400420138.

The previous prime is 123400420081. The next prime is 123400420181. The reversal of 123400420139 is 931024004321.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123400420139 is a prime.

It is not a weakly prime, because it can be changed into another prime (123400420739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61700210069 + 61700210070.

It is an arithmetic number, because the mean of its divisors is an integer number (61700210070).

Almost surely, 2^123400420139 is an apocalyptic number.

123400420139 is a deficient number, since it is larger than the sum of its proper divisors (1).

123400420139 is an equidigital number, since it uses as much as digits as its factorization.

123400420139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 29.

The spelling of 123400420139 in words is "one hundred twenty-three billion, four hundred million, four hundred twenty thousand, one hundred thirty-nine".