385987685 has 4 divisors (see below), whose sum is σ = 463185228. Its totient is φ = 308790144.

The previous prime is 385987661. The next prime is 385987697. The reversal of 385987685 is 586789583.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 586789583 = 643 ⋅912581.

It can be written as a sum of positive squares in 2 ways, for example, as 124389409 + 261598276 = 11153^2 + 16174^2 .

It is a cyclic number.

It is not a de Polignac number, because 385987685 - 2¹⁰ = 385986661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38598764 + ... + 38598773.

It is an arithmetic number, because the mean of its divisors is an integer number (115796307).

Almost surely, 2^385987685 is an apocalyptic number.

It is an amenable number.

385987685 is a deficient number, since it is larger than the sum of its proper divisors (77197543).

385987685 is an equidigital number, since it uses as much as digits as its factorization.

385987685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77197542.

The product of its digits is 14515200, while the sum is 59.

The square root of 385987685 is about 19646.5692933906. The cubic root of 385987685 is about 728.1001986677.

The spelling of 385987685 in words is "three hundred eighty-five million, nine hundred eighty-seven thousand, six hundred eighty-five".