25442005 has 4 divisors (see below), whose sum is σ = 30530412. Its totient is φ = 20353600.

The previous prime is 25442003. The next prime is 25442023. The reversal of 25442005 is 50024452.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7447441 + 17994564 = 2729^2 + 4242^2 .

It is not a de Polignac number, because 25442005 - 2¹ = 25442003 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 (25442003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2544196 + ... + 2544205.

It is an arithmetic number, because the mean of its divisors is an integer number (7632603).

Almost surely, 2^25442005 is an apocalyptic number.

It is an amenable number.

25442005 is a deficient number, since it is larger than the sum of its proper divisors (5088407).

25442005 is an equidigital number, since it uses as much as digits as its factorization.

25442005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5088406.

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 25442005 is about 5044.0068398050. The cubic root of 25442005 is about 294.1149572813.

Adding to 25442005 its reverse (50024452), we get a palindrome (75466457).

The spelling of 25442005 in words is "twenty-five million, four hundred forty-two thousand, five".