3978910785 has 8 divisors (see below), whose sum is σ = 6366257280. Its totient is φ = 2122085744.

The previous prime is 3978910781. The next prime is 3978910799. The reversal of 3978910785 is 5870198793.

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 3978910785 - 2² = 3978910781 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3978910781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132630345 + ... + 132630374.

It is an arithmetic number, because the mean of its divisors is an integer number (795782160).

Almost surely, 2^3978910785 is an apocalyptic number.

It is an amenable number.

3978910785 is a deficient number, since it is larger than the sum of its proper divisors (2387346495).

3978910785 is a wasteful number, since it uses less digits than its factorization.

3978910785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265260727.

The product of its (nonzero) digits is 3810240, while the sum is 57.

The square root of 3978910785 is about 63078.6079824214. The cubic root of 3978910785 is about 1584.6063812413.

The spelling of 3978910785 in words is "three billion, nine hundred seventy-eight million, nine hundred ten thousand, seven hundred eighty-five".