25821879 has 4 divisors (see below), whose sum is σ = 34429176. Its totient is φ = 17214584.

The previous prime is 25821857. The next prime is 25821883. The reversal of 25821879 is 97812852.

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 25821879 - 2¹² = 25817783 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25821879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25821899) 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, 4303644 + ... + 4303649.

It is an arithmetic number, because the mean of its divisors is an integer number (8607294).

Almost surely, 2^25821879 is an apocalyptic number.

25821879 is a deficient number, since it is larger than the sum of its proper divisors (8607297).

25821879 is an equidigital number, since it uses as much as digits as its factorization.

25821879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8607296.

The product of its digits is 80640, while the sum is 42.

The square root of 25821879 is about 5081.5232952334. The cubic root of 25821879 is about 295.5715396776.

The spelling of 25821879 in words is "twenty-five million, eight hundred twenty-one thousand, eight hundred seventy-nine".