3964399217 has 2 divisors, whose sum is σ = 3964399218. Its totient is φ = 3964399216.

The previous prime is 3964399207. The next prime is 3964399249. The reversal of 3964399217 is 7129934693.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2646999601 + 1317399616 = 51449^2 + 36296^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3964399217 is a prime.

It is a super-2 number, since 2×3964399217² = 31432922303500426178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3964399207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1982199608 + 1982199609.

It is an arithmetic number, because the mean of its divisors is an integer number (1982199609).

Almost surely, 2^3964399217 is an apocalyptic number.

It is an amenable number.

3964399217 is a deficient number, since it is larger than the sum of its proper divisors (1).

3964399217 is an equidigital number, since it uses as much as digits as its factorization.

3964399217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2204496, while the sum is 53.

The square root of 3964399217 is about 62963.4752614561. The cubic root of 3964399217 is about 1582.6776175997.

The spelling of 3964399217 in words is "three billion, nine hundred sixty-four million, three hundred ninety-nine thousand, two hundred seventeen".