25959643 has 4 divisors (see below), whose sum is σ = 27325960. Its totient is φ = 24593328.

The previous prime is 25959641. The next prime is 25959671. The reversal of 25959643 is 34695952.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25959643 - 2¹ = 25959641 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25959643.

It is not an unprimeable number, because it can be changed into a prime (25959641) 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 3 ways as a sum of consecutive naturals, for example, 683130 + ... + 683167.

It is an arithmetic number, because the mean of its divisors is an integer number (6831490).

Almost surely, 2^25959643 is an apocalyptic number.

25959643 is a deficient number, since it is larger than the sum of its proper divisors (1366317).

25959643 is a wasteful number, since it uses less digits than its factorization.

25959643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1366316.

The product of its digits is 291600, while the sum is 43.

The square root of 25959643 is about 5095.0606473329. The cubic root of 25959643 is about 296.0962486793.

The spelling of 25959643 in words is "twenty-five million, nine hundred fifty-nine thousand, six hundred forty-three".