1930289 has 2 divisors, whose sum is σ = 1930290. Its totient is φ = 1930288.

The previous prime is 1930261. The next prime is 1930297. The reversal of 1930289 is 9820391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1795600 + 134689 = 1340^2 + 367^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1930289 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1930219) 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, 965144 + 965145.

It is an arithmetic number, because the mean of its divisors is an integer number (965145).

2^1930289 is an apocalyptic number.

It is an amenable number.

1930289 is a deficient number, since it is larger than the sum of its proper divisors (1).

1930289 is an equidigital number, since it uses as much as digits as its factorization.

1930289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 1930289 is about 1389.3484084275. The cubic root of 1930289 is about 124.5109209089.

It can be divided in two parts, 19302 and 89, that added together give a palindrome (19391).

The spelling of 1930289 in words is "one million, nine hundred thirty thousand, two hundred eighty-nine".