13780909 has 8 divisors (see below), whose sum is σ = 14899040. Its totient is φ = 12702096.

The previous prime is 13780903. The next prime is 13780919. The reversal of 13780909 is 90908731.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13780909 - 2⁹ = 13780397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13780903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9099 + ... + 10504.

It is an arithmetic number, because the mean of its divisors is an integer number (1862380).

Almost surely, 2^13780909 is an apocalyptic number.

13780909 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

13780909 is a deficient number, since it is larger than the sum of its proper divisors (1118131).

13780909 is a wasteful number, since it uses less digits than its factorization.

13780909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19659.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 13780909 is about 3712.2646726762. The cubic root of 13780909 is about 239.7503712332.

The spelling of 13780909 in words is "thirteen million, seven hundred eighty thousand, nine hundred nine".