13720609 has 8 divisors (see below), whose sum is σ = 16063488. Its totient is φ = 11473440.

The previous prime is 13720591. The next prime is 13720613. The reversal of 13720609 is 90602731.

13720609 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13720609 - 2¹³ = 13712417 is a prime.

It is a super-2 number, since 2×13720609² = 376510222661762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13720639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23617 + ... + 24190.

It is an arithmetic number, because the mean of its divisors is an integer number (2007936).

Almost surely, 2^13720609 is an apocalyptic number.

It is an amenable number.

13720609 is a deficient number, since it is larger than the sum of its proper divisors (2342879).

13720609 is an equidigital number, since it uses as much as digits as its factorization.

13720609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47855.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 13720609 is about 3704.1340418511. The cubic root of 13720609 is about 239.4001745754.

The spelling of 13720609 in words is "thirteen million, seven hundred twenty thousand, six hundred nine".