1768421 has 2 divisors, whose sum is σ = 1768422. Its totient is φ = 1768420.

The previous prime is 1768411. The next prime is 1768423. The reversal of 1768421 is 1248671.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1079521 + 688900 = 1039^2 + 830^2 .

It is an emirp because it is prime and its reverse (1248671) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1768421 - 2¹⁰ = 1767397 is a prime.

It is a Sophie Germain prime.

Together with 1768423, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1768423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 884210 + 884211.

It is an arithmetic number, because the mean of its divisors is an integer number (884211).

2^1768421 is an apocalyptic number.

It is an amenable number.

1768421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1768421 is an equidigital number, since it uses as much as digits as its factorization.

1768421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 29.

The square root of 1768421 is about 1329.8199126198. The cubic root of 1768421 is about 120.9284689800.

The spelling of 1768421 in words is "one million, seven hundred sixty-eight thousand, four hundred twenty-one".