12420139 has 2 divisors, whose sum is σ = 12420140. Its totient is φ = 12420138.

The previous prime is 12420137. The next prime is 12420151. The reversal of 12420139 is 93102421.

12420139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12420139 - 2¹ = 12420137 is a prime.

Together with 12420137, 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 (12420131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6210069 + 6210070.

It is an arithmetic number, because the mean of its divisors is an integer number (6210070).

Almost surely, 2^12420139 is an apocalyptic number.

12420139 is a deficient number, since it is larger than the sum of its proper divisors (1).

12420139 is an equidigital number, since it uses as much as digits as its factorization.

12420139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 12420139 is about 3524.2217580623. The cubic root of 12420139 is about 231.5841428088.

The spelling of 12420139 in words is "twelve million, four hundred twenty thousand, one hundred thirty-nine".