13798109 has 4 divisors (see below), whose sum is σ = 14859516. Its totient is φ = 12736704.

The previous prime is 13798097. The next prime is 13798111. The reversal of 13798109 is 90189731.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7022500 + 6775609 = 2650^2 + 2603^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13798109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13798159) 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 3 ways as a sum of consecutive naturals, for example, 530684 + ... + 530709.

It is an arithmetic number, because the mean of its divisors is an integer number (3714879).

Almost surely, 2^13798109 is an apocalyptic number.

It is an amenable number.

13798109 is a deficient number, since it is larger than the sum of its proper divisors (1061407).

13798109 is a wasteful number, since it uses less digits than its factorization.

13798109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1061406.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 13798109 is about 3714.5805954374. The cubic root of 13798109 is about 239.8500741863.

The spelling of 13798109 in words is "thirteen million, seven hundred ninety-eight thousand, one hundred nine".