12943639 has 2 divisors, whose sum is σ = 12943640. Its totient is φ = 12943638.

The previous prime is 12943633. The next prime is 12943691. The reversal of 12943639 is 93634921.

It is a weak prime.

It is an emirp because it is prime and its reverse (93634921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12943639 - 2³ = 12943631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12943598 and 12943607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12943631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6471819 + 6471820.

It is an arithmetic number, because the mean of its divisors is an integer number (6471820).

Almost surely, 2^12943639 is an apocalyptic number.

12943639 is a deficient number, since it is larger than the sum of its proper divisors (1).

12943639 is an equidigital number, since it uses as much as digits as its factorization.

12943639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 37.

The square root of 12943639 is about 3597.7269212657. The cubic root of 12943639 is about 234.7931724800.

The spelling of 12943639 in words is "twelve million, nine hundred forty-three thousand, six hundred thirty-nine".