3921289 has 2 divisors, whose sum is σ = 3921290. Its totient is φ = 3921288.

The previous prime is 3921287. The next prime is 3921301. The reversal of 3921289 is 9821293.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3485689 + 435600 = 1867^2 + 660^2 .

It is an emirp because it is prime and its reverse (9821293) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3921289 - 2¹ = 3921287 is a prime.

Together with 3921287, it forms a pair of twin primes.

3921289 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (3921287) 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, 1960644 + 1960645.

It is an arithmetic number, because the mean of its divisors is an integer number (1960645).

Almost surely, 2^3921289 is an apocalyptic number.

It is an amenable number.

3921289 is a deficient number, since it is larger than the sum of its proper divisors (1).

3921289 is an equidigital number, since it uses as much as digits as its factorization.

3921289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 34.

The square root of 3921289 is about 1980.2244822242. The cubic root of 3921289 is about 157.6919839100.

It can be divided in two parts, 392 and 1289, that added together give a square (1681 = 41²).

The spelling of 3921289 in words is "three million, nine hundred twenty-one thousand, two hundred eighty-nine".