13982509 has 2 divisors, whose sum is σ = 13982510. Its totient is φ = 13982508.

The previous prime is 13982503. The next prime is 13982531. The reversal of 13982509 is 90528931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8236900 + 5745609 = 2870^2 + 2397^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13982509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13982503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6991254 + 6991255.

It is an arithmetic number, because the mean of its divisors is an integer number (6991255).

Almost surely, 2^13982509 is an apocalyptic number.

It is an amenable number.

13982509 is a deficient number, since it is larger than the sum of its proper divisors (1).

13982509 is an equidigital number, since it uses as much as digits as its factorization.

13982509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 13982509 is about 3739.3193230854. The cubic root of 13982509 is about 240.9138136403.

The spelling of 13982509 in words is "thirteen million, nine hundred eighty-two thousand, five hundred nine".