1780349 has 2 divisors, whose sum is σ = 1780350. Its totient is φ = 1780348.

The previous prime is 1780333. The next prime is 1780351. The reversal of 1780349 is 9430871.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1768900 + 11449 = 1330^2 + 107^2 .

It is a cyclic number.

It is not a de Polignac number, because 1780349 - 2⁴ = 1780333 is a prime.

Together with 1780351, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1780309) 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, 890174 + 890175.

It is an arithmetic number, because the mean of its divisors is an integer number (890175).

2^1780349 is an apocalyptic number.

It is an amenable number.

1780349 is a deficient number, since it is larger than the sum of its proper divisors (1).

1780349 is an equidigital number, since it uses as much as digits as its factorization.

1780349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 1780349 is about 1334.2971932819. The cubic root of 1780349 is about 121.1997474825.

The spelling of 1780349 in words is "one million, seven hundred eighty thousand, three hundred forty-nine".