25443940 has 24 divisors (see below), whose sum is σ = 53665920. Its totient is φ = 10133088.

The previous prime is 25443937. The next prime is 25443949. The reversal of 25443940 is 4934452.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (25443949) 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, 2119 + ... + 7441.

It is an arithmetic number, because the mean of its divisors is an integer number (2236080).

Almost surely, 2^25443940 is an apocalyptic number.

25443940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25443940 is an abundant number, since it is smaller than the sum of its proper divisors (28221980).

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

25443940 is a wasteful number, since it uses less digits than its factorization.

25443940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5571 (or 5569 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 25443940 is about 5044.1986479519. The cubic root of 25443940 is about 294.1224134286.

The spelling of 25443940 in words is "twenty-five million, four hundred forty-three thousand, nine hundred forty".