13949839 has 2 divisors, whose sum is σ = 13949840. Its totient is φ = 13949838.

The previous prime is 13949821. The next prime is 13949863. The reversal of 13949839 is 93894931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13949839 - 2¹³ = 13941647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13949939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6974919 + 6974920.

It is an arithmetic number, because the mean of its divisors is an integer number (6974920).

Almost surely, 2^13949839 is an apocalyptic number.

13949839 is a deficient number, since it is larger than the sum of its proper divisors (1).

13949839 is an equidigital number, since it uses as much as digits as its factorization.

13949839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952, while the sum is 46.

The square root of 13949839 is about 3734.9483262824. The cubic root of 13949839 is about 240.7260363689.

The spelling of 13949839 in words is "thirteen million, nine hundred forty-nine thousand, eight hundred thirty-nine".