340642217 has 2 divisors, whose sum is σ = 340642218. Its totient is φ = 340642216.

The previous prime is 340642201. The next prime is 340642219. The reversal of 340642217 is 712246043.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 276257641 + 64384576 = 16621^2 + 8024^2 .

It is a cyclic number.

It is not a de Polignac number, because 340642217 - 2⁴ = 340642201 is a prime.

Together with 340642219, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 340642217.

It is not a weakly prime, because it can be changed into another prime (340642219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170321108 + 170321109.

It is an arithmetic number, because the mean of its divisors is an integer number (170321109).

Almost surely, 2^340642217 is an apocalyptic number.

It is an amenable number.

340642217 is a deficient number, since it is larger than the sum of its proper divisors (1).

340642217 is an equidigital number, since it uses as much as digits as its factorization.

340642217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 340642217 is about 18456.4952523495. The cubic root of 340642217 is about 698.3923767377.

The spelling of 340642217 in words is "three hundred forty million, six hundred forty-two thousand, two hundred seventeen".