13209869 has 4 divisors (see below), whose sum is σ = 13217760. Its totient is φ = 13201980.

The previous prime is 13209863. The next prime is 13209871. The reversal of 13209869 is 96890231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 13209869 - 2²⁰ = 12161293 is a prime.

It is a super-2 number, since 2×13209869² = 349001277994322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13209863) 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, 329 + ... + 5150.

It is an arithmetic number, because the mean of its divisors is an integer number (3304440).

Almost surely, 2^13209869 is an apocalyptic number.

It is an amenable number.

13209869 is a deficient number, since it is larger than the sum of its proper divisors (7891).

13209869 is an equidigital number, since it uses as much as digits as its factorization.

13209869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7890.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 13209869 is about 3634.5383475759. The cubic root of 13209869 is about 236.3920337004.

The spelling of 13209869 in words is "thirteen million, two hundred nine thousand, eight hundred sixty-nine".