3978849659 has 8 divisors (see below), whose sum is σ = 4108210560. Its totient is φ = 3849552000.

The previous prime is 3978849631. The next prime is 3978849671. The reversal of 3978849659 is 9569488793.

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 3978849659 - 2⁸ = 3978849403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3978849629) 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, 135059 + ... + 161859.

It is an arithmetic number, because the mean of its divisors is an integer number (513526320).

Almost surely, 2^3978849659 is an apocalyptic number.

3978849659 is a deficient number, since it is larger than the sum of its proper divisors (129360901).

3978849659 is a wasteful number, since it uses less digits than its factorization.

3978849659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31621.

The product of its digits is 117573120, while the sum is 68.

The square root of 3978849659 is about 63078.1234581372. The cubic root of 3978849659 is about 1584.5982666968.

The spelling of 3978849659 in words is "three billion, nine hundred seventy-eight million, eight hundred forty-nine thousand, six hundred fifty-nine".