25943840 has 48 divisors (see below), whose sum is σ = 66012408. Its totient is φ = 9578496.

The previous prime is 25943833. The next prime is 25943843. The reversal of 25943840 is 4834952.

It can be written as a sum of positive squares in 4 ways, for example, as 18696976 + 7246864 = 4324^2 + 2692^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 25943840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25943843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4157 + ... + 8316.

Almost surely, 2^25943840 is an apocalyptic number.

25943840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25943840 is an abundant number, since it is smaller than the sum of its proper divisors (40068568).

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

25943840 is a wasteful number, since it uses less digits than its factorization.

25943840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12501 (or 12493 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 25943840 is about 5093.5095955539. The cubic root of 25943840 is about 296.0361533635.

The spelling of 25943840 in words is "twenty-five million, nine hundred forty-three thousand, eight hundred forty".