25447 has 2 divisors, whose sum is σ = 25448. Its totient is φ = 25446.
The previous prime is 25439. The next prime is 25453. The reversal of 25447 is 74452.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 25447 - 23 = 25439 is a prime.
It is a nialpdrome in base 13.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (25457) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12723 + 12724.
It is an arithmetic number, because the mean of its divisors is an integer number (12724).
225447 is an apocalyptic number.
25447 is a deficient number, since it is larger than the sum of its proper divisors (1).
25447 is an equidigital number, since it uses as much as digits as its factorization.
25447 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 1120, while the sum is 22.
The square root of 25447 is about 159.5211584712. The cubic root of 25447 is about 29.4134203774.
Subtracting from 25447 its sum of digits (22), we obtain a triangular number (25425 = T225).
Adding to 25447 its reverse (74452), we get a palindrome (99899).
It can be divided in two parts, 25 and 447, that multiplied together give a triangular number (11175 = T149).
The spelling of 25447 in words is "twenty-five thousand, four hundred forty-seven".
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