25403 has 8 divisors (see below), whose sum is σ = 30720. Its totient is φ = 20520.

The previous prime is 25391. The next prime is 25409. The reversal of 25403 is 30452.

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

It is not a de Polignac number, because 25403 - 2⁶ = 25339 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 25403.

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 in 7 ways as a sum of consecutive naturals, for example, 38 + ... + 228.

It is an arithmetic number, because the mean of its divisors is an integer number (3840).

2²⁵⁴⁰³ is an apocalyptic number.

25403 is a deficient number, since it is larger than the sum of its proper divisors (5317).

25403 is a wasteful number, since it uses less digits than its factorization.

25403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217.

The product of its (nonzero) digits is 120, while the sum is 14.

The square root of 25403 is about 159.3831860643. The cubic root of 25403 is about 29.3964578391.

Adding to 25403 its reverse (30452), we get a palindrome (55855).

The spelling of 25403 in words is "twenty-five thousand, four hundred three".