25855397 has 2 divisors, whose sum is σ = 25855398. Its totient is φ = 25855396.

The previous prime is 25855391. The next prime is 25855411. The reversal of 25855397 is 79355852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25542916 + 312481 = 5054^2 + 559^2 .

It is a cyclic number.

It is not a de Polignac number, because 25855397 - 2¹⁰ = 25854373 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25855391) 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 as a sum of consecutive naturals, namely, 12927698 + 12927699.

It is an arithmetic number, because the mean of its divisors is an integer number (12927699).

Almost surely, 2^25855397 is an apocalyptic number.

It is an amenable number.

25855397 is a deficient number, since it is larger than the sum of its proper divisors (1).

25855397 is an equidigital number, since it uses as much as digits as its factorization.

25855397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 378000, while the sum is 44.

The square root of 25855397 is about 5084.8202524770. The cubic root of 25855397 is about 295.6993729179.

It can be divided in two parts, 258 and 55397, that added together give a palindrome (55655).

The spelling of 25855397 in words is "twenty-five million, eight hundred fifty-five thousand, three hundred ninety-seven".