25408 has 14 divisors (see below), whose sum is σ = 50546. Its totient is φ = 12672.

The previous prime is 25391. The next prime is 25409. The reversal of 25408 is 80452.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 23104 + 2304 = 152^2 + 48^2 .

It is an Ulam number.

It is a plaindrome in base 15.

It is a zygodrome in base 15.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 135 + ... + 262.

2²⁵⁴⁰⁸ is an apocalyptic number.

It is an amenable number.

25408 is a deficient number, since it is larger than the sum of its proper divisors (25138).

25408 is an equidigital number, since it uses as much as digits as its factorization.

25408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409 (or 399 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 25408 is about 159.3988707614. The cubic root of 25408 is about 29.3983863862.

It can be divided in two parts, 2 and 5408, that multiplied together give a square (10816 = 104²).

The spelling of 25408 in words is "twenty-five thousand, four hundred eight".