25440025 has 12 divisors (see below), whose sum is σ = 33972652. Its totient is φ = 18786240.

The previous prime is 25440013. The next prime is 25440043. The reversal of 25440025 is 52004452.

It can be written as a sum of positive squares in 6 ways, for example, as 9853321 + 15586704 = 3139^2 + 3948^2 .

It is not a de Polignac number, because 25440025 - 2²¹ = 23342873 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25439978 and 25440005.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38814 + ... + 39463.

Almost surely, 2^25440025 is an apocalyptic number.

25440025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25440025 is a deficient number, since it is larger than the sum of its proper divisors (8532627).

25440025 is a wasteful number, since it uses less digits than its factorization.

25440025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78300 (or 78295 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 25440025 is about 5043.8105634530. The cubic root of 25440025 is about 294.1073273438.

Adding to 25440025 its reverse (52004452), we get a palindrome (77444477).

The spelling of 25440025 in words is "twenty-five million, four hundred forty thousand, twenty-five".