25401 has 4 divisors (see below), whose sum is σ = 33872. Its totient is φ = 16932.

The previous prime is 25391. The next prime is 25409. The reversal of 25401 is 10452.

25401 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 25401 - 2⁹ = 24889 is a prime.

It is a D-number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 25401.

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 3 ways as a sum of consecutive naturals, for example, 4231 + ... + 4236.

It is an arithmetic number, because the mean of its divisors is an integer number (8468).

2²⁵⁴⁰¹ is an apocalyptic number.

It is an amenable number.

25401 is a deficient number, since it is larger than the sum of its proper divisors (8471).

25401 is an equidigital number, since it uses as much as digits as its factorization.

25401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8470.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 25401 is about 159.3769117532. The cubic root of 25401 is about 29.3956863494.

Adding to 25401 its reverse (10452), we get a palindrome (35853).

The spelling of 25401 in words is "twenty-five thousand, four hundred one".