25645449 has 4 divisors (see below), whose sum is σ = 34193936. Its totient is φ = 17096964.

The previous prime is 25645447. The next prime is 25645457. The reversal of 25645449 is 94454652.

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 not a de Polignac number, because 25645449 - 2¹ = 25645447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25645447) 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, 4274239 + ... + 4274244.

It is an arithmetic number, because the mean of its divisors is an integer number (8548484).

Almost surely, 2^25645449 is an apocalyptic number.

It is an amenable number.

25645449 is a deficient number, since it is larger than the sum of its proper divisors (8548487).

25645449 is an equidigital number, since it uses as much as digits as its factorization.

25645449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8548486.

The product of its digits is 172800, while the sum is 39.

The square root of 25645449 is about 5064.1335882854. The cubic root of 25645449 is about 294.8968288074.

The spelling of 25645449 in words is "twenty-five million, six hundred forty-five thousand, four hundred forty-nine".