3978644846 has 32 divisors (see below), whose sum is σ = 6758138880. Its totient is φ = 1740952800.

The previous prime is 3978644843. The next prime is 3978644867. The reversal of 3978644846 is 6484468793.

It is a super-2 number, since 2×3978644846² = 31659229621204727432, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3978644843) 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, 31535 + ... + 94613.

It is an arithmetic number, because the mean of its divisors is an integer number (211191840).

Almost surely, 2^3978644846 is an apocalyptic number.

3978644846 is a deficient number, since it is larger than the sum of its proper divisors (2779494034).

3978644846 is a wasteful number, since it uses less digits than its factorization.

3978644846 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63200.

The product of its digits is 27869184, while the sum is 59.

The square root of 3978644846 is about 63076.4999504570. The cubic root of 3978644846 is about 1584.5710769375.

The spelling of 3978644846 in words is "three billion, nine hundred seventy-eight million, six hundred forty-four thousand, eight hundred forty-six".