25218245 has 8 divisors (see below), whose sum is σ = 32589816. Its totient is φ = 18622656.

The previous prime is 25218233. The next prime is 25218269. The reversal of 25218245 is 54281252.

It can be written as a sum of positive squares in 4 ways, for example, as 5094049 + 20124196 = 2257^2 + 4486^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25218245 - 2⁴ = 25218229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 193922 + ... + 194051.

It is an arithmetic number, because the mean of its divisors is an integer number (4073727).

Almost surely, 2^25218245 is an apocalyptic number.

It is an amenable number.

25218245 is a deficient number, since it is larger than the sum of its proper divisors (7371571).

25218245 is a wasteful number, since it uses less digits than its factorization.

25218245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387991.

The product of its digits is 6400, while the sum is 29.

The square root of 25218245 is about 5021.7770758965. Note that the first 3 decimals coincide. The cubic root of 25218245 is about 293.2501794544.

Adding to 25218245 its reverse (54281252), we get a palindrome (79499497).

The spelling of 25218245 in words is "twenty-five million, two hundred eighteen thousand, two hundred forty-five".