13925509 has 4 divisors (see below), whose sum is σ = 14996716. Its totient is φ = 12854304.

The previous prime is 13925467. The next prime is 13925531. The reversal of 13925509 is 90552931.

It is a happy number.

13925509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3621409 + 10304100 = 1903^2 + 3210^2 .

It is a cyclic number.

It is not a de Polignac number, because 13925509 - 2⁹ = 13924997 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 (13920509) 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, 535584 + ... + 535609.

It is an arithmetic number, because the mean of its divisors is an integer number (3749179).

Almost surely, 2^13925509 is an apocalyptic number.

It is an amenable number.

13925509 is a deficient number, since it is larger than the sum of its proper divisors (1071207).

13925509 is a wasteful number, since it uses less digits than its factorization.

13925509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1071206.

The product of its (nonzero) digits is 12150, while the sum is 34.

The square root of 13925509 is about 3731.6898316982. The cubic root of 13925509 is about 240.5860043402.

The spelling of 13925509 in words is "thirteen million, nine hundred twenty-five thousand, five hundred nine".