25706 has 4 divisors (see below), whose sum is σ = 38562. Its totient is φ = 12852.

The previous prime is 25703. The next prime is 25717. The reversal of 25706 is 60752.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 24025 + 1681 = 155^2 + 41^2 .

It is an Ulam number.

It is a Curzon number.

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (25703) 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 as a sum of consecutive naturals, namely, 6425 + ... + 6428.

2²⁵⁷⁰⁶ is an apocalyptic number.

25706 is a deficient number, since it is larger than the sum of its proper divisors (12856).

25706 is a wasteful number, since it uses less digits than its factorization.

25706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12855.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 25706 is about 160.3309078126. The cubic root of 25706 is about 29.5128738218.

The spelling of 25706 in words is "twenty-five thousand, seven hundred six".