6840257 has 2 divisors, whose sum is σ = 6840258. Its totient is φ = 6840256.

The previous prime is 6840241. The next prime is 6840263. The reversal of 6840257 is 7520486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4456321 + 2383936 = 2111^2 + 1544^2 .

It is a cyclic number.

It is not a de Polignac number, because 6840257 - 2⁴ = 6840241 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6840287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3420128 + 3420129.

It is an arithmetic number, because the mean of its divisors is an integer number (3420129).

Almost surely, 2^6840257 is an apocalyptic number.

It is an amenable number.

6840257 is a deficient number, since it is larger than the sum of its proper divisors (1).

6840257 is an equidigital number, since it uses as much as digits as its factorization.

6840257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 6840257 is about 2615.3884988659. The cubic root of 6840257 is about 189.8267765612.

The spelling of 6840257 in words is "six million, eight hundred forty thousand, two hundred fifty-seven".