13844639 has 2 divisors, whose sum is σ = 13844640. Its totient is φ = 13844638.

The previous prime is 13844617. The next prime is 13844657. The reversal of 13844639 is 93644831.

13844639 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13844639 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13844659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6922319 + 6922320.

It is an arithmetic number, because the mean of its divisors is an integer number (6922320).

Almost surely, 2^13844639 is an apocalyptic number.

13844639 is a deficient number, since it is larger than the sum of its proper divisors (1).

13844639 is an equidigital number, since it uses as much as digits as its factorization.

13844639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 38.

The square root of 13844639 is about 3720.8384807728. The cubic root of 13844639 is about 240.1193792667.

The spelling of 13844639 in words is "thirteen million, eight hundred forty-four thousand, six hundred thirty-nine".