25443985 has 48 divisors (see below), whose sum is σ = 38782800. Its totient is φ = 15912960.

The previous prime is 25443959. The next prime is 25443989. The reversal of 25443985 is 58934452.

It can be written as a sum of positive squares in 8 ways, for example, as 4293184 + 21150801 = 2072^2 + 4599^2 .

It is not a de Polignac number, because 25443985 - 2¹¹ = 25441937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25443989) 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 47 ways as a sum of consecutive naturals, for example, 170691 + ... + 170839.

It is an arithmetic number, because the mean of its divisors is an integer number (807975).

Almost surely, 2^25443985 is an apocalyptic number.

It is an amenable number.

25443985 is a deficient number, since it is larger than the sum of its proper divisors (13338815).

25443985 is a wasteful number, since it uses less digits than its factorization.

25443985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226 (or 219 counting only the distinct ones).

The product of its digits is 172800, while the sum is 40.

The square root of 25443985 is about 5044.2031085197. The cubic root of 25443985 is about 294.1225868229.

The spelling of 25443985 in words is "twenty-five million, four hundred forty-three thousand, nine hundred eighty-five".