25427821 has 4 divisors (see below), whose sum is σ = 25548544. Its totient is φ = 25307100.

The previous prime is 25427819. The next prime is 25427839. The reversal of 25427821 is 12872452.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25427821 - 2¹ = 25427819 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 (25427881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60045 + ... + 60466.

It is an arithmetic number, because the mean of its divisors is an integer number (6387136).

Almost surely, 2^25427821 is an apocalyptic number.

It is an amenable number.

25427821 is a deficient number, since it is larger than the sum of its proper divisors (120723).

25427821 is a wasteful number, since it uses less digits than its factorization.

25427821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120722.

The product of its digits is 8960, while the sum is 31.

The square root of 25427821 is about 5042.6006187284. The cubic root of 25427821 is about 294.0602904414.

The spelling of 25427821 in words is "twenty-five million, four hundred twenty-seven thousand, eight hundred twenty-one".