27840257 has 2 divisors, whose sum is σ = 27840258. Its totient is φ = 27840256.

The previous prime is 27840233. The next prime is 27840287. The reversal of 27840257 is 75204872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27081616 + 758641 = 5204^2 + 871^2 .

It is a cyclic number.

It is not a de Polignac number, because 27840257 - 2⁶ = 27840193 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27840287) 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, 13920128 + 13920129.

It is an arithmetic number, because the mean of its divisors is an integer number (13920129).

Almost surely, 2^27840257 is an apocalyptic number.

It is an amenable number.

27840257 is a deficient number, since it is larger than the sum of its proper divisors (1).

27840257 is an equidigital number, since it uses as much as digits as its factorization.

27840257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31360, while the sum is 35.

The square root of 27840257 is about 5276.3867371526. The cubic root of 27840257 is about 303.0803266719.

The spelling of 27840257 in words is "twenty-seven million, eight hundred forty thousand, two hundred fifty-seven".