13699909 has 4 divisors (see below), whose sum is σ = 14505804. Its totient is φ = 12894016.

The previous prime is 13699853. The next prime is 13699921. The reversal of 13699909 is 90999631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90999631 = 109 ⋅834859.

It can be written as a sum of positive squares in 2 ways, for example, as 9302500 + 4397409 = 3050^2 + 2097^2 .

It is a cyclic number.

It is not a de Polignac number, because 13699909 - 2¹⁵ = 13667141 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 (13699949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 402922 + ... + 402955.

It is an arithmetic number, because the mean of its divisors is an integer number (3626451).

Almost surely, 2^13699909 is an apocalyptic number.

It is an amenable number.

13699909 is a deficient number, since it is larger than the sum of its proper divisors (805895).

13699909 is an equidigital number, since it uses as much as digits as its factorization.

13699909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805894.

The product of its (nonzero) digits is 118098, while the sum is 46.

The square root of 13699909 is about 3701.3388118355. The cubic root of 13699909 is about 239.2797212769.

The spelling of 13699909 in words is "thirteen million, six hundred ninety-nine thousand, nine hundred nine".