12740639 has 2 divisors, whose sum is σ = 12740640. Its totient is φ = 12740638.

The previous prime is 12740603. The next prime is 12740641. The reversal of 12740639 is 93604721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12740639 - 2¹² = 12736543 is a prime.

Together with 12740641, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12740699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6370319 + 6370320.

It is an arithmetic number, because the mean of its divisors is an integer number (6370320).

Almost surely, 2^12740639 is an apocalyptic number.

12740639 is a deficient number, since it is larger than the sum of its proper divisors (1).

12740639 is an equidigital number, since it uses as much as digits as its factorization.

12740639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 12740639 is about 3569.4031713999. The cubic root of 12740639 is about 233.5592489961.

The spelling of 12740639 in words is "twelve million, seven hundred forty thousand, six hundred thirty-nine".