3991914389 has 2 divisors, whose sum is σ = 3991914390. Its totient is φ = 3991914388.

The previous prime is 3991914323. The next prime is 3991914397. The reversal of 3991914389 is 9834191993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3913503364 + 78411025 = 62558^2 + 8855^2 .

It is an emirp because it is prime and its reverse (9834191993) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3991914389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3991914889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1995957194 + 1995957195.

It is an arithmetic number, because the mean of its divisors is an integer number (1995957195).

Almost surely, 2^3991914389 is an apocalyptic number.

It is an amenable number.

3991914389 is a deficient number, since it is larger than the sum of its proper divisors (1).

3991914389 is an equidigital number, since it uses as much as digits as its factorization.

3991914389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1889568, while the sum is 56.

The square root of 3991914389 is about 63181.5984998797. The cubic root of 3991914389 is about 1586.3307381816.

The spelling of 3991914389 in words is "three billion, nine hundred ninety-one million, nine hundred fourteen thousand, three hundred eighty-nine".