13428709 has 8 divisors (see below), whose sum is σ = 15403968. Its totient is φ = 11467680.

The previous prime is 13428707. The next prime is 13428721. The reversal of 13428709 is 90782431.

13428709 = 63² + 64² + ... + 343².

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

It is not a de Polignac number, because 13428709 - 2¹ = 13428707 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 (13428703) 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, 1447 + ... + 5380.

It is an arithmetic number, because the mean of its divisors is an integer number (1925496).

Almost surely, 2^13428709 is an apocalyptic number.

It is an amenable number.

13428709 is a deficient number, since it is larger than the sum of its proper divisors (1975259).

13428709 is an equidigital number, since it uses as much as digits as its factorization.

13428709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7115.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 13428709 is about 3664.5202960278. The cubic root of 13428709 is about 237.6902792757.

The spelling of 13428709 in words is "thirteen million, four hundred twenty-eight thousand, seven hundred nine".