3948278978 has 24 divisors (see below), whose sum is σ = 7111586304. Its totient is φ = 1637533800.

The previous prime is 3948278977. The next prime is 3948278989. The reversal of 3948278978 is 8798728493.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3948278977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 646778 + ... + 652853.

It is an arithmetic number, because the mean of its divisors is an integer number (296316096).

Almost surely, 2^3948278978 is an apocalyptic number.

3948278978 is a deficient number, since it is larger than the sum of its proper divisors (3163307326).

3948278978 is a wasteful number, since it uses less digits than its factorization.

3948278978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1299678 (or 1299671 counting only the distinct ones).

The product of its digits is 48771072, while the sum is 65.

The square root of 3948278978 is about 62835.3322422982. The cubic root of 3948278978 is about 1580.5295156783.

The spelling of 3948278978 in words is "three billion, nine hundred forty-eight million, two hundred seventy-eight thousand, nine hundred seventy-eight".