3978274785 has 16 divisors (see below), whose sum is σ = 6377906304. Its totient is φ = 2117524352.

The previous prime is 3978274763. The next prime is 3978274799. The reversal of 3978274785 is 5874728793.

It is a cyclic number.

It is not a de Polignac number, because 3978274785 - 2⁹ = 3978274273 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 256092 + ... + 271181.

It is an arithmetic number, because the mean of its divisors is an integer number (398619144).

Almost surely, 2^3978274785 is an apocalyptic number.

It is an amenable number.

3978274785 is a deficient number, since it is larger than the sum of its proper divisors (2399631519).

3978274785 is a wasteful number, since it uses less digits than its factorization.

3978274785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527784.

The product of its digits is 23708160, while the sum is 60.

The square root of 3978274785 is about 63073.5664521993. The cubic root of 3978274785 is about 1584.5219474674.

The spelling of 3978274785 in words is "three billion, nine hundred seventy-eight million, two hundred seventy-four thousand, seven hundred eighty-five".