13725409 has 8 divisors (see below), whose sum is σ = 14926248. Its totient is φ = 12568320.

The previous prime is 13725401. The next prime is 13725431. The reversal of 13725409 is 90452731.

It can be written as a sum of positive squares in 4 ways, for example, as 7273809 + 6451600 = 2697^2 + 2540^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 13725409 - 2³ = 13725401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13725401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10282 + ... + 11539.

It is an arithmetic number, because the mean of its divisors is an integer number (1865781).

Almost surely, 2^13725409 is an apocalyptic number.

It is an amenable number.

13725409 is a deficient number, since it is larger than the sum of its proper divisors (1200839).

13725409 is a wasteful number, since it uses less digits than its factorization.

13725409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21875.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 13725409 is about 3704.7819099105. The cubic root of 13725409 is about 239.4280884690.

The spelling of 13725409 in words is "thirteen million, seven hundred twenty-five thousand, four hundred nine".