385778857 has 4 divisors (see below), whose sum is σ = 385897600. Its totient is φ = 385660116.

The previous prime is 385778837. The next prime is 385778879. The reversal of 385778857 is 758877583.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 758877583 = 1747 ⋅434389.

It is a cyclic number.

It is not a de Polignac number, because 385778857 - 2²⁷ = 251561129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (385778837) 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, 54357 + ... + 61042.

It is an arithmetic number, because the mean of its divisors is an integer number (96474400).

Almost surely, 2^385778857 is an apocalyptic number.

It is an amenable number.

385778857 is a deficient number, since it is larger than the sum of its proper divisors (118743).

385778857 is a wasteful number, since it uses less digits than its factorization.

385778857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118742.

The product of its digits is 13171200, while the sum is 58.

The square root of 385778857 is about 19641.2539569143. The cubic root of 385778857 is about 727.9688687982.

The spelling of 385778857 in words is "three hundred eighty-five million, seven hundred seventy-eight thousand, eight hundred fifty-seven".