25397 has 4 divisors (see below), whose sum is σ = 25740. Its totient is φ = 25056.

The previous prime is 25391. The next prime is 25409. The reversal of 25397 is 79352.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 11236 + 14161 = 106^2 + 119^2 .

It is a cyclic number.

It is not a de Polignac number, because 25397 - 2¹⁰ = 24373 is a prime.

It is a Duffinian number.

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 25397.

It is not an unprimeable number, because it can be changed into a prime (25391) 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, 8 + ... + 225.

It is an arithmetic number, because the mean of its divisors is an integer number (6435).

2²⁵³⁹⁷ is an apocalyptic number.

It is an amenable number.

25397 is a deficient number, since it is larger than the sum of its proper divisors (343).

25397 is a wasteful number, since it uses less digits than its factorization.

25397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342.

The product of its digits is 1890, while the sum is 26.

The square root of 25397 is about 159.3643623901. The cubic root of 25397 is about 29.3941432485.

The spelling of 25397 in words is "twenty-five thousand, three hundred ninety-seven".