25656189 has 16 divisors (see below), whose sum is σ = 38029824. Its totient is φ = 15278400.

The previous prime is 25656181. The next prime is 25656199. The reversal of 25656189 is 98165652.

It is not a de Polignac number, because 25656189 - 2³ = 25656181 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 25656189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25656181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9402 + ... + 11819.

It is an arithmetic number, because the mean of its divisors is an integer number (2376864).

Almost surely, 2^25656189 is an apocalyptic number.

It is an amenable number.

25656189 is a deficient number, since it is larger than the sum of its proper divisors (12373635).

25656189 is a wasteful number, since it uses less digits than its factorization.

25656189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21268.

The product of its digits is 129600, while the sum is 42.

The square root of 25656189 is about 5065.1938758551. The cubic root of 25656189 is about 294.9379894557.

The spelling of 25656189 in words is "twenty-five million, six hundred fifty-six thousand, one hundred eighty-nine".