25604389 has 2 divisors, whose sum is σ = 25604390. Its totient is φ = 25604388.

The previous prime is 25604297. The next prime is 25604399. The reversal of 25604389 is 98340652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25583364 + 21025 = 5058^2 + 145^2 .

It is a cyclic number.

It is not a de Polignac number, because 25604389 - 2¹⁷ = 25473317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25604399) 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 as a sum of consecutive naturals, namely, 12802194 + 12802195.

It is an arithmetic number, because the mean of its divisors is an integer number (12802195).

Almost surely, 2^25604389 is an apocalyptic number.

It is an amenable number.

25604389 is a deficient number, since it is larger than the sum of its proper divisors (1).

25604389 is an equidigital number, since it uses as much as digits as its factorization.

25604389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 25604389 is about 5060.0779638262. The cubic root of 25604389 is about 294.7393618603.

The spelling of 25604389 in words is "twenty-five million, six hundred four thousand, three hundred eighty-nine".