340718689 has 2 divisors, whose sum is σ = 340718690. Its totient is φ = 340718688.

The previous prime is 340718657. The next prime is 340718701. The reversal of 340718689 is 986817043.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 257763025 + 82955664 = 16055^2 + 9108^2 .

It is an emirp because it is prime and its reverse (986817043) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 340718689 - 2⁵ = 340718657 is a prime.

It is not a weakly prime, because it can be changed into another prime (340718629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170359344 + 170359345.

It is an arithmetic number, because the mean of its divisors is an integer number (170359345).

Almost surely, 2^340718689 is an apocalyptic number.

It is an amenable number.

340718689 is a deficient number, since it is larger than the sum of its proper divisors (1).

340718689 is an equidigital number, since it uses as much as digits as its factorization.

340718689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 340718689 is about 18458.5668186888. The cubic root of 340718689 is about 698.4446343687. Note that the first 3 decimals are identical.

The spelling of 340718689 in words is "three hundred forty million, seven hundred eighteen thousand, six hundred eighty-nine".