3928891217 has 2 divisors, whose sum is σ = 3928891218. Its totient is φ = 3928891216.

The previous prime is 3928891207. The next prime is 3928891223. The reversal of 3928891217 is 7121988293.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3888644881 + 40246336 = 62359^2 + 6344^2 .

It is a cyclic number.

It is not a de Polignac number, because 3928891217 - 2²² = 3924696913 is a prime.

It is not a weakly prime, because it can be changed into another prime (3928891207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1964445608 + 1964445609.

It is an arithmetic number, because the mean of its divisors is an integer number (1964445609).

Almost surely, 2^3928891217 is an apocalyptic number.

It is an amenable number.

3928891217 is a deficient number, since it is larger than the sum of its proper divisors (1).

3928891217 is an equidigital number, since it uses as much as digits as its factorization.

3928891217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 50.

The square root of 3928891217 is about 62680.8680300457. The cubic root of 3928891217 is about 1577.9382412995.

The spelling of 3928891217 in words is "three billion, nine hundred twenty-eight million, eight hundred ninety-one thousand, two hundred seventeen".