25865642 has 8 divisors (see below), whose sum is σ = 42325632. Its totient is φ = 11757100.

The previous prime is 25865641. The next prime is 25865657. The reversal of 25865642 is 24656852.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 25865596 and 25865605.

It is not an unprimeable number, because it can be changed into a prime (25865641) 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, 587834 + ... + 587877.

It is an arithmetic number, because the mean of its divisors is an integer number (5290704).

Almost surely, 2^25865642 is an apocalyptic number.

25865642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

25865642 is a deficient number, since it is larger than the sum of its proper divisors (16459990).

25865642 is a wasteful number, since it uses less digits than its factorization.

25865642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1175724.

The product of its digits is 115200, while the sum is 38.

The square root of 25865642 is about 5085.8275629439. The cubic root of 25865642 is about 295.7384239528.

It can be divided in two parts, 2586 and 5642, that added together give a palindrome (8228).

The spelling of 25865642 in words is "twenty-five million, eight hundred sixty-five thousand, six hundred forty-two".