13780009 has 2 divisors, whose sum is σ = 13780010. Its totient is φ = 13780008.

The previous prime is 13780003. The next prime is 13780033. The reversal of 13780009 is 90008731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13344409 + 435600 = 3653^2 + 660^2 .

It is a cyclic number.

It is not a de Polignac number, because 13780009 - 2¹¹ = 13777961 is a prime.

It is not a weakly prime, because it can be changed into another prime (13780003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6890004 + 6890005.

It is an arithmetic number, because the mean of its divisors is an integer number (6890005).

Almost surely, 2^13780009 is an apocalyptic number.

It is an amenable number.

13780009 is a deficient number, since it is larger than the sum of its proper divisors (1).

13780009 is an equidigital number, since it uses as much as digits as its factorization.

13780009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 13780009 is about 3712.1434508920. The cubic root of 13780009 is about 239.7451519348.

The spelling of 13780009 in words is "thirteen million, seven hundred eighty thousand, nine".