385975217 has 4 divisors (see below), whose sum is σ = 386835300. Its totient is φ = 385115136.

The previous prime is 385975211. The next prime is 385975279. The reversal of 385975217 is 712579583.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 712579583 = 23 ⋅30981721.

It can be written as a sum of positive squares in 2 ways, for example, as 291419041 + 94556176 = 17071^2 + 9724^2 .

It is a cyclic number.

It is not a de Polignac number, because 385975217 - 2⁶ = 385975153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (385975211) 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, 429368 + ... + 430265.

It is an arithmetic number, because the mean of its divisors is an integer number (96708825).

Almost surely, 2^385975217 is an apocalyptic number.

It is an amenable number.

385975217 is a deficient number, since it is larger than the sum of its proper divisors (860083).

385975217 is an equidigital number, since it uses as much as digits as its factorization.

385975217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860082.

The product of its digits is 529200, while the sum is 47.

The square root of 385975217 is about 19646.2519835209. The cubic root of 385975217 is about 728.0923589953.

The spelling of 385975217 in words is "three hundred eighty-five million, nine hundred seventy-five thousand, two hundred seventeen".