3981843969 has 16 divisors (see below), whose sum is σ = 5396159040. Its totient is φ = 2611160640.

The previous prime is 3981843953. The next prime is 3981843997. The reversal of 3981843969 is 9693481893.

It is not a de Polignac number, because 3981843969 - 2⁴ = 3981843953 is a prime.

It is a super-2 number, since 2×3981843969² = 31710162786923345922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3981843269) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128539 + ... + 156479.

It is an arithmetic number, because the mean of its divisors is an integer number (337259940).

Almost surely, 2^3981843969 is an apocalyptic number.

It is an amenable number.

3981843969 is a deficient number, since it is larger than the sum of its proper divisors (1414315071).

3981843969 is a wasteful number, since it uses less digits than its factorization.

3981843969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28720.

The product of its digits is 10077696, while the sum is 60.

The square root of 3981843969 is about 63101.8539268063. The cubic root of 3981843969 is about 1584.9956670429.

The spelling of 3981843969 in words is "three billion, nine hundred eighty-one million, eight hundred forty-three thousand, nine hundred sixty-nine".