13729609 has 4 divisors (see below), whose sum is σ = 14452240. Its totient is φ = 13006980.

The previous prime is 13729567. The next prime is 13729633. The reversal of 13729609 is 90692731.

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.

It is a cyclic number.

It is not a de Polignac number, because 13729609 - 2⁷ = 13729481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13729649) 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, 361287 + ... + 361324.

It is an arithmetic number, because the mean of its divisors is an integer number (3613060).

Almost surely, 2^13729609 is an apocalyptic number.

13729609 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

13729609 is a deficient number, since it is larger than the sum of its proper divisors (722631).

13729609 is an equidigital number, since it uses as much as digits as its factorization.

13729609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722630.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 13729609 is about 3705.3487015394. The cubic root of 13729609 is about 239.4525077879.

The spelling of 13729609 in words is "thirteen million, seven hundred twenty-nine thousand, six hundred nine".