3981944895 has 32 divisors (see below), whose sum is σ = 6405315840. Its totient is φ = 2112337920.

The previous prime is 3981944891. The next prime is 3981944899. The reversal of 3981944895 is 5984491893.

It is an interprime number because it is at equal distance from previous prime (3981944891) and next prime (3981944899).

It is not a de Polignac number, because 3981944895 - 2² = 3981944891 is a prime.

It is a super-2 number, since 2×3981944895² = 31711770293633122050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3981944891) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3271327 + ... + 3272543.

It is an arithmetic number, because the mean of its divisors is an integer number (200166120).

Almost surely, 2^3981944895 is an apocalyptic number.

3981944895 is a deficient number, since it is larger than the sum of its proper divisors (2423370945).

3981944895 is a wasteful number, since it uses less digits than its factorization.

3981944895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2215.

The product of its digits is 11197440, while the sum is 60.

The square root of 3981944895 is about 63102.6536288293. The cubic root of 3981944895 is about 1585.0090583195.

The spelling of 3981944895 in words is "three billion, nine hundred eighty-one million, nine hundred forty-four thousand, eight hundred ninety-five".