3978811849 has 8 divisors (see below), whose sum is σ = 4024944000. Its totient is φ = 3932854992.

The previous prime is 3978811847. The next prime is 3978811871. The reversal of 3978811849 is 9481188793.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3978811849 - 2¹ = 3978811847 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3978811793 and 3978811802.

It is not an unprimeable number, because it can be changed into a prime (3978811847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2112 + ... + 89230.

It is an arithmetic number, because the mean of its divisors is an integer number (503118000).

Almost surely, 2^3978811849 is an apocalyptic number.

It is an amenable number.

3978811849 is a deficient number, since it is larger than the sum of its proper divisors (46132151).

3978811849 is a wasteful number, since it uses less digits than its factorization.

3978811849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87647.

The product of its digits is 3483648, while the sum is 58.

The square root of 3978811849 is about 63077.8237497141. The cubic root of 3978811849 is about 1584.5932473356.

The spelling of 3978811849 in words is "three billion, nine hundred seventy-eight million, eight hundred eleven thousand, eight hundred forty-nine".