25425 has 18 divisors (see below), whose sum is σ = 45942. Its totient is φ = 13440.

The previous prime is 25423. The next prime is 25439. The reversal of 25425 is 52452.

25425 is a nontrivial binomial coefficient, being equal to C(226, 2).

It can be written as a sum of positive squares in 3 ways, for example, as 144 + 25281 = 12^2 + 159^2 .

It is not a de Polignac number, because 25425 - 2¹ = 25423 is a prime.

It is an Ulam number.

25425 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 25398 and 25407.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 25425.

It is not an unprimeable number, because it can be changed into a prime (25423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 169 + ... + 281.

2²⁵⁴²⁵ is an apocalyptic number.

25425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

25425 is the 225-th triangular number and also the 113-rd hexagonal number.

It is an amenable number.

25425 is a deficient number, since it is larger than the sum of its proper divisors (20517).

25425 is a wasteful number, since it uses less digits than its factorization.

25425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129 (or 121 counting only the distinct ones).

The product of its digits is 400, while the sum is 18.

The square root of 25425 is about 159.4521871910. The cubic root of 25425 is about 29.4049415545.

Adding to 25425 its reverse (52452), we get a palindrome (77877).

The spelling of 25425 in words is "twenty-five thousand, four hundred twenty-five".