1930309 has 2 divisors, whose sum is σ = 1930310. Its totient is φ = 1930308.

The previous prime is 1930307. The next prime is 1930349. The reversal of 1930309 is 9030391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1633284 + 297025 = 1278^2 + 545^2 .

It is an emirp because it is prime and its reverse (9030391) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1930309 - 2¹ = 1930307 is a prime.

Together with 1930307, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1930301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 965154 + 965155.

It is an arithmetic number, because the mean of its divisors is an integer number (965155).

2^1930309 is an apocalyptic number.

It is an amenable number.

1930309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1930309 is an equidigital number, since it uses as much as digits as its factorization.

1930309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 729, while the sum is 25.

The square root of 1930309 is about 1389.3556060275. The cubic root of 1930309 is about 124.5113509325.

The spelling of 1930309 in words is "one million, nine hundred thirty thousand, three hundred nine".