25984609 has 16 divisors (see below), whose sum is σ = 32342400. Its totient is φ = 20369664.

The previous prime is 25984583. The next prime is 25984613. The reversal of 25984609 is 90648952.

It is not a de Polignac number, because 25984609 - 2⁵ = 25984577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25984649) 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 15 ways as a sum of consecutive naturals, for example, 489 + ... + 7225.

It is an arithmetic number, because the mean of its divisors is an integer number (2021400).

Almost surely, 2^25984609 is an apocalyptic number.

25984609 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

25984609 is a deficient number, since it is larger than the sum of its proper divisors (6357791).

25984609 is a wasteful number, since it uses less digits than its factorization.

25984609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6792.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 25984609 is about 5097.5100784599. The cubic root of 25984609 is about 296.1911391780.

The spelling of 25984609 in words is "twenty-five million, nine hundred eighty-four thousand, six hundred nine".