340788689 has 2 divisors, whose sum is σ = 340788690. Its totient is φ = 340788688.

The previous prime is 340788667. The next prime is 340788691. The reversal of 340788689 is 986887043.

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., 310041664 + 30747025 = 17608^2 + 5545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-340788689 is a prime.

It is a super-2 number, since 2×340788689² = 232273861100677442, which contains 22 as substring.

Together with 340788691, 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 340788689.

It is not a weakly prime, because it can be changed into another prime (340788629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170394344 + 170394345.

It is an arithmetic number, because the mean of its divisors is an integer number (170394345).

Almost surely, 2^340788689 is an apocalyptic number.

It is an amenable number.

340788689 is a deficient number, since it is larger than the sum of its proper divisors (1).

340788689 is an equidigital number, since it uses as much as digits as its factorization.

340788689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2322432, while the sum is 53.

The square root of 340788689 is about 18460.4628598527. The cubic root of 340788689 is about 698.4924624628.

The spelling of 340788689 in words is "three hundred forty million, seven hundred eighty-eight thousand, six hundred eighty-nine".