25406 has 4 divisors (see below), whose sum is σ = 38112. Its totient is φ = 12702.

The previous prime is 25391. The next prime is 25409. The reversal of 25406 is 60452.

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

It is an Ulam number.

It is a nialpdrome in base 13.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 25406.

It is not an unprimeable number, because it can be changed into a prime (25409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6350 + ... + 6353.

It is an arithmetic number, because the mean of its divisors is an integer number (9528).

2²⁵⁴⁰⁶ is an apocalyptic number.

25406 is a deficient number, since it is larger than the sum of its proper divisors (12706).

25406 is a wasteful number, since it uses less digits than its factorization.

25406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12705.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 25406 is about 159.3925970677. The cubic root of 25406 is about 29.3976149977.

Adding to 25406 its reverse (60452), we get a palindrome (85858).

The spelling of 25406 in words is "twenty-five thousand, four hundred six".