3994324857 has 6 divisors (see below), whose sum is σ = 5769580362. Its totient is φ = 2662883232.

The previous prime is 3994324849. The next prime is 3994324891. The reversal of 3994324857 is 7584234993.

3994324857 is a `hidden beast` number, since 399 + 4 + 3 + 248 + 5 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2894009616 + 1100315241 = 53796^2 + 33171^2 .

It is not a de Polignac number, because 3994324857 - 2³ = 3994324849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3994324157) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 221906928 + ... + 221906945.

It is an arithmetic number, because the mean of its divisors is an integer number (961596727).

Almost surely, 2^3994324857 is an apocalyptic number.

It is an amenable number.

3994324857 is a deficient number, since it is larger than the sum of its proper divisors (1775255505).

3994324857 is a wasteful number, since it uses less digits than its factorization.

3994324857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443813879 (or 443813876 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 54.

The square root of 3994324857 is about 63200.6713334597. The cubic root of 3994324857 is about 1586.6499693170.

The spelling of 3994324857 in words is "three billion, nine hundred ninety-four million, three hundred twenty-four thousand, eight hundred fifty-seven".