13643239 has 2 divisors, whose sum is σ = 13643240. Its totient is φ = 13643238.

The previous prime is 13643213. The next prime is 13643243. The reversal of 13643239 is 93234631.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13643239 is a prime.

It is a super-2 number, since 2×13643239² = 372275940822242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13643239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13643039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6821619 + 6821620.

It is an arithmetic number, because the mean of its divisors is an integer number (6821620).

Almost surely, 2^13643239 is an apocalyptic number.

13643239 is a deficient number, since it is larger than the sum of its proper divisors (1).

13643239 is an equidigital number, since it uses as much as digits as its factorization.

13643239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 31.

The square root of 13643239 is about 3693.6755407047. The cubic root of 13643239 is about 238.9493365531.

The spelling of 13643239 in words is "thirteen million, six hundred forty-three thousand, two hundred thirty-nine".