3978370647 has 40 divisors (see below), whose sum is σ = 6300657792. Its totient is φ = 2497262400.

The previous prime is 3978370637. The next prime is 3978370699. The reversal of 3978370647 is 7460738793.

It is a happy number.

It is not a de Polignac number, because 3978370647 - 2¹⁰ = 3978369623 is a prime.

It is a super-2 number, since 2×3978370647² = 31654866009822397218, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3978370593 and 3978370602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3978370637) 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 39 ways as a sum of consecutive naturals, for example, 71497 + ... + 114317.

Almost surely, 2^3978370647 is an apocalyptic number.

3978370647 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

3978370647 is a deficient number, since it is larger than the sum of its proper divisors (2322287145).

3978370647 is a wasteful number, since it uses less digits than its factorization.

3978370647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42901 (or 42892 counting only the distinct ones).

The product of its (nonzero) digits is 5334336, while the sum is 54.

The square root of 3978370647 is about 63074.3263697679. The cubic root of 3978370647 is about 1584.5346744434.

The spelling of 3978370647 in words is "three billion, nine hundred seventy-eight million, three hundred seventy thousand, six hundred forty-seven".