12940139 has 2 divisors, whose sum is σ = 12940140. Its totient is φ = 12940138.

The previous prime is 12940129. The next prime is 12940163. The reversal of 12940139 is 93104921.

It is a happy number.

12940139 is digitally balanced in base 3, 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 12940139 - 2²⁰ = 11891563 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12940129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6470069 + 6470070.

It is an arithmetic number, because the mean of its divisors is an integer number (6470070).

Almost surely, 2^12940139 is an apocalyptic number.

12940139 is a deficient number, since it is larger than the sum of its proper divisors (1).

12940139 is an equidigital number, since it uses as much as digits as its factorization.

12940139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 12940139 is about 3597.2404701382. The cubic root of 12940139 is about 234.7720076390.

The spelling of 12940139 in words is "twelve million, nine hundred forty thousand, one hundred thirty-nine".