25443009 has 12 divisors (see below), whose sum is σ = 36855936. Its totient is φ = 16913592.

The previous prime is 25443007. The next prime is 25443017. The reversal of 25443009 is 90034452.

It is not a de Polignac number, because 25443009 - 2¹ = 25443007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25443007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 549 + ... + 7154.

It is an arithmetic number, because the mean of its divisors is an integer number (3071328).

Almost surely, 2^25443009 is an apocalyptic number.

It is an amenable number.

25443009 is a deficient number, since it is larger than the sum of its proper divisors (11412927).

25443009 is a wasteful number, since it uses less digits than its factorization.

25443009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8076 (or 8073 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 25443009 is about 5044.1063628754. The cubic root of 25443009 is about 294.1188260478.

The spelling of 25443009 in words is "twenty-five million, four hundred forty-three thousand, nine".