13825309 has 4 divisors (see below), whose sum is σ = 14199004. Its totient is φ = 13451616.

The previous prime is 13825307. The next prime is 13825351. The reversal of 13825309 is 90352831.

It is a happy number.

13825309 is digitally balanced in base 3, 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, and also an emirpimes, since its reverse is a distinct semiprime: 90352831 = 367 ⋅246193.

It can be written as a sum of positive squares in 2 ways, for example, as 10745284 + 3080025 = 3278^2 + 1755^2 .

It is a cyclic number.

It is not a de Polignac number, because 13825309 - 2¹ = 13825307 is a prime.

It is a super-2 number, since 2×13825309² = 382278337890962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13825303) 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, 186792 + ... + 186865.

It is an arithmetic number, because the mean of its divisors is an integer number (3549751).

Almost surely, 2^13825309 is an apocalyptic number.

It is an amenable number.

13825309 is a deficient number, since it is larger than the sum of its proper divisors (373695).

13825309 is an equidigital number, since it uses as much as digits as its factorization.

13825309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373694.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 13825309 is about 3718.2400406644. The cubic root of 13825309 is about 240.0075749924.

The spelling of 13825309 in words is "thirteen million, eight hundred twenty-five thousand, three hundred nine".