12289639 has 2 divisors, whose sum is σ = 12289640. Its totient is φ = 12289638.

The previous prime is 12289631. The next prime is 12289679. The reversal of 12289639 is 93698221.

It is a happy number.

It is an a-pointer prime, because the next prime (12289679) can be obtained adding 12289639 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12289639 - 2³ = 12289631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12289631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6144819 + 6144820.

It is an arithmetic number, because the mean of its divisors is an integer number (6144820).

Almost surely, 2^12289639 is an apocalyptic number.

12289639 is a deficient number, since it is larger than the sum of its proper divisors (1).

12289639 is an equidigital number, since it uses as much as digits as its factorization.

12289639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 40.

The square root of 12289639 is about 3505.6581407776. The cubic root of 12289639 is about 230.7701905459.

The spelling of 12289639 in words is "twelve million, two hundred eighty-nine thousand, six hundred thirty-nine".