340172489 has 2 divisors, whose sum is σ = 340172490. Its totient is φ = 340172488.

The previous prime is 340172477. The next prime is 340172549. The reversal of 340172489 is 984271043.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 231283264 + 108889225 = 15208^2 + 10435^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-340172489 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (340172089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170086244 + 170086245.

It is an arithmetic number, because the mean of its divisors is an integer number (170086245).

Almost surely, 2^340172489 is an apocalyptic number.

It is an amenable number.

340172489 is a deficient number, since it is larger than the sum of its proper divisors (1).

340172489 is an equidigital number, since it uses as much as digits as its factorization.

340172489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 340172489 is about 18443.7655862354. The cubic root of 340172489 is about 698.0712134138.

The spelling of 340172489 in words is "three hundred forty million, one hundred seventy-two thousand, four hundred eighty-nine".