13408639 has 2 divisors, whose sum is σ = 13408640. Its totient is φ = 13408638.

The previous prime is 13408627. The next prime is 13408669. The reversal of 13408639 is 93680431.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13408639 - 2⁷ = 13408511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13408669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6704319 + 6704320.

It is an arithmetic number, because the mean of its divisors is an integer number (6704320).

Almost surely, 2^13408639 is an apocalyptic number.

13408639 is a deficient number, since it is larger than the sum of its proper divisors (1).

13408639 is an equidigital number, since it uses as much as digits as its factorization.

13408639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 13408639 is about 3661.7808508976. The cubic root of 13408639 is about 237.5718061733.

The spelling of 13408639 in words is "thirteen million, four hundred eight thousand, six hundred thirty-nine".