13699809 has 6 divisors (see below), whose sum is σ = 19788626. Its totient is φ = 9133200.

The previous prime is 13699793. The next prime is 13699853. The reversal of 13699809 is 90899631.

It can be written as a sum of positive squares in only one way, i.e., 13483584 + 216225 = 3672^2 + 465^2 .

It is not a de Polignac number, because 13699809 - 2⁴ = 13699793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13699409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 761092 + ... + 761109.

Almost surely, 2^13699809 is an apocalyptic number.

It is an amenable number.

13699809 is a deficient number, since it is larger than the sum of its proper divisors (6088817).

13699809 is a wasteful number, since it uses less digits than its factorization.

13699809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1522207 (or 1522204 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 13699809 is about 3701.3253031853. The cubic root of 13699809 is about 239.2791390825.

The spelling of 13699809 in words is "thirteen million, six hundred ninety-nine thousand, eight hundred nine".