13821839 has 2 divisors, whose sum is σ = 13821840. Its totient is φ = 13821838.

The previous prime is 13821823. The next prime is 13821853. The reversal of 13821839 is 93812831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13821839 - 2⁴ = 13821823 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 13821799 and 13821808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13821869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6910919 + 6910920.

It is an arithmetic number, because the mean of its divisors is an integer number (6910920).

Almost surely, 2^13821839 is an apocalyptic number.

13821839 is a deficient number, since it is larger than the sum of its proper divisors (1).

13821839 is an equidigital number, since it uses as much as digits as its factorization.

13821839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 35.

The square root of 13821839 is about 3717.7733927715. The cubic root of 13821839 is about 239.9874935613.

The spelling of 13821839 in words is "thirteen million, eight hundred twenty-one thousand, eight hundred thirty-nine".