25565939 has 16 divisors (see below), whose sum is σ = 30051840. Its totient is φ = 21297600.

The previous prime is 25565933. The next prime is 25565941. The reversal of 25565939 is 93956552.

It is a cyclic number.

It is not a de Polignac number, because 25565939 - 2¹⁶ = 25500403 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25565939.

It is not an unprimeable number, because it can be changed into a prime (25565933) 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 15 ways as a sum of consecutive naturals, for example, 42239 + ... + 42839.

It is an arithmetic number, because the mean of its divisors is an integer number (1878240).

Almost surely, 2^25565939 is an apocalyptic number.

25565939 is a deficient number, since it is larger than the sum of its proper divisors (4485901).

25565939 is a wasteful number, since it uses less digits than its factorization.

25565939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770.

The product of its digits is 364500, while the sum is 44.

The square root of 25565939 is about 5056.2771878132. The cubic root of 25565939 is about 294.5917516729.

The spelling of 25565939 in words is "twenty-five million, five hundred sixty-five thousand, nine hundred thirty-nine".