25400440 has 32 divisors (see below), whose sum is σ = 61548480. Its totient is φ = 9378432.

The previous prime is 25400411. The next prime is 25400449. The reversal of 25400440 is 4400452.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25400449) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 23904 + ... + 24943.

It is an arithmetic number, because the mean of its divisors is an integer number (1923390).

Almost surely, 2^25400440 is an apocalyptic number.

25400440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25400440 is an abundant number, since it is smaller than the sum of its proper divisors (36148040).

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

25400440 is a wasteful number, since it uses less digits than its factorization.

25400440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48871 (or 48867 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 25400440 is about 5039.8849193211. The cubic root of 25400440 is about 293.9547032502.

Adding to 25400440 its reverse (4400452), we get a palindrome (29800892).

The spelling of 25400440 in words is "twenty-five million, four hundred thousand, four hundred forty".