25400240 has 20 divisors (see below), whose sum is σ = 59055744. Its totient is φ = 10160064.

The previous prime is 25400233. The next prime is 25400251. The reversal of 25400240 is 4200452.

It is a tau number, because it is divible by the number of its divisors (20).

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 3 ways as a sum of consecutive naturals, for example, 158672 + ... + 158831.

Almost surely, 2^25400240 is an apocalyptic number.

25400240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25400240 is an abundant number, since it is smaller than the sum of its proper divisors (33655504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25400240 is a wasteful number, since it uses less digits than its factorization.

25400240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317516 (or 317510 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 25400240 is about 5039.8650775591. The cubic root of 25400240 is about 293.9539317269.

Adding to 25400240 its reverse (4200452), we get a palindrome (29600692).

The spelling of 25400240 in words is "twenty-five million, four hundred thousand, two hundred forty".