25438663 has 4 divisors (see below), whose sum is σ = 26777560. Its totient is φ = 24099768.

The previous prime is 25438643. The next prime is 25438691. The reversal of 25438663 is 36683452.

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 25438663 - 2⁹ = 25438151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25438643) 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 in 3 ways as a sum of consecutive naturals, for example, 669420 + ... + 669457.

It is an arithmetic number, because the mean of its divisors is an integer number (6694390).

Almost surely, 2^25438663 is an apocalyptic number.

25438663 is a deficient number, since it is larger than the sum of its proper divisors (1338897).

25438663 is a wasteful number, since it uses less digits than its factorization.

25438663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1338896.

The product of its digits is 103680, while the sum is 37.

The square root of 25438663 is about 5043.6755446797. The cubic root of 25438663 is about 294.1020786418.

The spelling of 25438663 in words is "twenty-five million, four hundred thirty-eight thousand, six hundred sixty-three".