13809969 has 12 divisors (see below), whose sum is σ = 20019636. Its totient is φ = 9173472.

The previous prime is 13809949. The next prime is 13809977. The reversal of 13809969 is 96990831.

13809969 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 12510369 + 1299600 = 3537^2 + 1140^2 .

It is not a de Polignac number, because 13809969 - 2⁵ = 13809937 is a prime.

It is a super-2 number, since 2×13809969² = 381430487561922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13809919) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19 + ... + 5255.

It is an arithmetic number, because the mean of its divisors is an integer number (1668303).

Almost surely, 2^13809969 is an apocalyptic number.

It is an amenable number.

13809969 is a deficient number, since it is larger than the sum of its proper divisors (6209667).

13809969 is a wasteful number, since it uses less digits than its factorization.

13809969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5536 (or 5533 counting only the distinct ones).

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

The square root of 13809969 is about 3716.1766642613. The cubic root of 13809969 is about 239.9187745966.

The spelling of 13809969 in words is "thirteen million, eight hundred nine thousand, nine hundred sixty-nine".