340243493 has 2 divisors, whose sum is σ = 340243494. Its totient is φ = 340243492.

The previous prime is 340243489. The next prime is 340243567. The reversal of 340243493 is 394342043.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 337346689 + 2896804 = 18367^2 + 1702^2 .

It is an emirp because it is prime and its reverse (394342043) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 340243493 - 2² = 340243489 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340243433) 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 as a sum of consecutive naturals, namely, 170121746 + 170121747.

It is an arithmetic number, because the mean of its divisors is an integer number (170121747).

Almost surely, 2^340243493 is an apocalyptic number.

It is an amenable number.

340243493 is a deficient number, since it is larger than the sum of its proper divisors (1).

340243493 is an equidigital number, since it uses as much as digits as its factorization.

340243493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 32.

The square root of 340243493 is about 18445.6903638763. The cubic root of 340243493 is about 698.1197793638.

The spelling of 340243493 in words is "three hundred forty million, two hundred forty-three thousand, four hundred ninety-three".