13309425 has 36 divisors (see below), whose sum is σ = 24059100. Its totient is φ = 7032960.

The previous prime is 13309423. The next prime is 13309427. The reversal of 13309425 is 52490331.

It is an interprime number because it is at equal distance from previous prime (13309423) and next prime (13309427).

It can be written as a sum of positive squares in 6 ways, for example, as 968256 + 12341169 = 984^2 + 3513^2 .

It is not a de Polignac number, because 13309425 - 2¹ = 13309423 is a prime.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13309421) 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 35 ways as a sum of consecutive naturals, for example, 33327 + ... + 33723.

Almost surely, 2^13309425 is an apocalyptic number.

13309425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13309425 is a deficient number, since it is larger than the sum of its proper divisors (10749675).

13309425 is a wasteful number, since it uses less digits than its factorization.

13309425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562 (or 554 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 13309425 is about 3648.2084644384. The cubic root of 13309425 is about 236.9844031823.

Adding to 13309425 its reverse (52490331), we get a palindrome (65799756).

The spelling of 13309425 in words is "thirteen million, three hundred nine thousand, four hundred twenty-five".