25958009 has 24 divisors (see below), whose sum is σ = 34345920. Its totient is φ = 19150560.

The previous prime is 25957999. The next prime is 25958017. The reversal of 25958009 is 90085952.

It is a happy number.

It is not a de Polignac number, because 25958009 - 2⁴ = 25957993 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25958069) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15287 + ... + 16899.

It is an arithmetic number, because the mean of its divisors is an integer number (1431080).

Almost surely, 2^25958009 is an apocalyptic number.

It is an amenable number.

25958009 is a deficient number, since it is larger than the sum of its proper divisors (8387911).

25958009 is a wasteful number, since it uses less digits than its factorization.

25958009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1661 (or 1650 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 25958009 is about 5094.9002934307. The cubic root of 25958009 is about 296.0900360691.

The spelling of 25958009 in words is "twenty-five million, nine hundred fifty-eight thousand, nine".