3959945785 has 8 divisors (see below), whose sum is σ = 4757813640. Its totient is φ = 3164037504.

The previous prime is 3959945777. The next prime is 3959945789. The reversal of 3959945785 is 5875499593.

It can be written as a sum of positive squares in 4 ways, for example, as 543309481 + 3416636304 = 23309^2 + 58452^2 .

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 3959945785 - 2³ = 3959945777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3959945789) 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, 485442 + ... + 493531.

It is an arithmetic number, because the mean of its divisors is an integer number (594726705).

Almost surely, 2^3959945785 is an apocalyptic number.

It is an amenable number.

3959945785 is a deficient number, since it is larger than the sum of its proper divisors (797867855).

3959945785 is an equidigital number, since it uses as much as digits as its factorization.

3959945785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979787.

The product of its digits is 61236000, while the sum is 64.

The square root of 3959945785 is about 62928.1001222824. The cubic root of 3959945785 is about 1582.0847587008.

The spelling of 3959945785 in words is "three billion, nine hundred fifty-nine million, nine hundred forty-five thousand, seven hundred eighty-five".