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25993 = 1117139

25993 has 8 divisors (see below), whose sum is σ = 30240. Its totient is φ = 22080.

The previous prime is 25981. The next prime is 25997. The reversal of 25993 is 39952.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-25993 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25997) 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 7 ways as a sum of consecutive naturals, for example, 118 + ... + 256.

It is an arithmetic number, because the mean of its divisors is an integer number (3780).

225993 is an apocalyptic number.

It is an amenable number.

25993 is a deficient number, since it is larger than the sum of its proper divisors (4247).

25993 is a wasteful number, since it uses less digits than its factorization.

25993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167.

The product of its digits is 2430, while the sum is 28.

The square root of 25993 is about 161.2234474262. The cubic root of 25993 is about 29.6223017951.

It can be divided in two parts, 2 and 5993, that added together give a palindrome (5995).

The spelling of 25993 in words is "twenty-five thousand, nine hundred ninety-three".

Divisors: 1 11 17 139 187 1529 2363 25993