25436 has 6 divisors (see below), whose sum is σ = 44520. Its totient is φ = 12716.

The previous prime is 25423. The next prime is 25439. The reversal of 25436 is 63452.

It is a d-powerful number, because it can be written as 2¹³ + 5³ + 4⁷ + 3⁶ + 6 .

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25439) by changing a digit.

25436 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3176 + ... + 3183.

It is an arithmetic number, because the mean of its divisors is an integer number (7420).

2²⁵⁴³⁶ is an apocalyptic number.

It is an amenable number.

25436 is a deficient number, since it is larger than the sum of its proper divisors (19084).

25436 is a wasteful number, since it uses less digits than its factorization.

25436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6363 (or 6361 counting only the distinct ones).

The product of its digits is 720, while the sum is 20.

The square root of 25436 is about 159.4866765595. The cubic root of 25436 is about 29.4091815771.

Adding to 25436 its reverse (63452), we get a palindrome (88888).

The spelling of 25436 in words is "twenty-five thousand, four hundred thirty-six".