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15397 = 89173

15397 has 4 divisors (see below), whose sum is σ = 15660. Its totient is φ = 15136.

The previous prime is 15391. The next prime is 15401. The reversal of 15397 is 79351.

15397 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, and also an emirpimes, since its reverse is a distinct semiprime: 79351 = 731087.

It can be written as a sum of positive squares in 2 ways, for example, as 8836 + 6561 = 94^2 + 81^2 .

It is a cyclic number.

It is not a de Polignac number, because 15397 - 27 = 15269 is a prime.

It is an Ulam number.

It is a Duffinian number.

15397 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3 + ... + 175.

It is an arithmetic number, because the mean of its divisors is an integer number (3915).

It is an amenable number.

15397 is a deficient number, since it is larger than the sum of its proper divisors (263).

15397 is an equidigital number, since it uses as much as digits as its factorization.

15397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262.

The product of its digits is 945, while the sum is 25.

The square root of 15397 is about 124.0846485267. The cubic root of 15397 is about 24.8778036957.

It can be divided in two parts, 153 and 97, that multiplied together give a palindrome (14841).

The spelling of 15397 in words is "fifteen thousand, three hundred ninety-seven".

Divisors: 1 89 173 15397