3966843919 has 4 divisors (see below), whose sum is σ = 3969579240. Its totient is φ = 3964108600.

The previous prime is 3966843887. The next prime is 3966843929. The reversal of 3966843919 is 9193486693.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9193486693 = 127 ⋅72389659.

It is a cyclic number.

It is not a de Polignac number, because 3966843919 - 2⁵ = 3966843887 is a prime.

It is a super-2 number, since 2×3966843919² = 31471701355414557122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3966843929) 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 in 3 ways as a sum of consecutive naturals, for example, 1365484 + ... + 1368385.

It is an arithmetic number, because the mean of its divisors is an integer number (992394810).

Almost surely, 2^3966843919 is an apocalyptic number.

3966843919 is a deficient number, since it is larger than the sum of its proper divisors (2735321).

3966843919 is a wasteful number, since it uses less digits than its factorization.

3966843919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2735320.

The product of its digits is 7558272, while the sum is 58.

The square root of 3966843919 is about 62982.8859214946. The cubic root of 3966843919 is about 1583.0028774832.

The spelling of 3966843919 in words is "three billion, nine hundred sixty-six million, eight hundred forty-three thousand, nine hundred nineteen".