25605242 has 8 divisors (see below), whose sum is σ = 41362356. Its totient is φ = 11817792.

The previous prime is 25605241. The next prime is 25605259. The reversal of 25605242 is 24250652.

It can be written as a sum of positive squares in 2 ways, for example, as 18309841 + 7295401 = 4279^2 + 2701^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (26), and also a Moran number because the ratio is a prime number: 984817 = 25605242 / (2 + 5 + 6 + 0 + 5 + 2 + 4 + 2).

It is not an unprimeable number, because it can be changed into a prime (25605241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 492383 + ... + 492434.

Almost surely, 2^25605242 is an apocalyptic number.

25605242 is a deficient number, since it is larger than the sum of its proper divisors (15757114).

25605242 is a wasteful number, since it uses less digits than its factorization.

25605242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 984832.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 25605242 is about 5060.1622503631. The cubic root of 25605242 is about 294.7426348653.

Adding to 25605242 its reverse (24250652), we get a palindrome (49855894).

The spelling of 25605242 in words is "twenty-five million, six hundred five thousand, two hundred forty-two".