384818857 has 4 divisors (see below), whose sum is σ = 385368516. Its totient is φ = 384269200.

The previous prime is 384818807. The next prime is 384818881. The reversal of 384818857 is 758818483.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 758818483 = 67 ⋅11325649.

It can be written as a sum of positive squares in 2 ways, for example, as 345179241 + 39639616 = 18579^2 + 6296^2 .

It is a cyclic number.

It is not a de Polignac number, because 384818857 - 2¹⁵ = 384786089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (384818807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273778 + ... + 275179.

It is an arithmetic number, because the mean of its divisors is an integer number (96342129).

Almost surely, 2^384818857 is an apocalyptic number.

It is an amenable number.

384818857 is a deficient number, since it is larger than the sum of its proper divisors (549659).

384818857 is an equidigital number, since it uses as much as digits as its factorization.

384818857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549658.

The product of its digits is 1720320, while the sum is 52.

The square root of 384818857 is about 19616.8003762081. The cubic root of 384818857 is about 727.3645237666.

The spelling of 384818857 in words is "three hundred eighty-four million, eight hundred eighteen thousand, eight hundred fifty-seven".