138406139 has 2 divisors, whose sum is σ = 138406140. Its totient is φ = 138406138.

The previous prime is 138406123. The next prime is 138406171. The reversal of 138406139 is 931604831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138406139 - 2⁴ = 138406123 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 138406099 and 138406108.

It is not a weakly prime, because it can be changed into another prime (138406189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69203069 + 69203070.

It is an arithmetic number, because the mean of its divisors is an integer number (69203070).

Almost surely, 2^138406139 is an apocalyptic number.

138406139 is a deficient number, since it is larger than the sum of its proper divisors (1).

138406139 is an equidigital number, since it uses as much as digits as its factorization.

138406139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 138406139 is about 11764.6138483165. The cubic root of 138406139 is about 517.2713813540.

The spelling of 138406139 in words is "one hundred thirty-eight million, four hundred six thousand, one hundred thirty-nine".