12639269 has 2 divisors, whose sum is σ = 12639270. Its totient is φ = 12639268.

The previous prime is 12639257. The next prime is 12639283. The reversal of 12639269 is 96293621.

12639269 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 can be written as a sum of positive squares in only one way, i.e., 11937025 + 702244 = 3455^2 + 838^2 .

It is an emirp because it is prime and its reverse (96293621) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12639269 is a prime.

It is a super-2 number, since 2×12639269² = 319502241708722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12639229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6319634 + 6319635.

It is an arithmetic number, because the mean of its divisors is an integer number (6319635).

Almost surely, 2^12639269 is an apocalyptic number.

It is an amenable number.

12639269 is a deficient number, since it is larger than the sum of its proper divisors (1).

12639269 is an equidigital number, since it uses as much as digits as its factorization.

12639269 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 38.

The square root of 12639269 is about 3555.1749605329. The cubic root of 12639269 is about 232.9381662809.

The spelling of 12639269 in words is "twelve million, six hundred thirty-nine thousand, two hundred sixty-nine".