385917813 has 12 divisors (see below), whose sum is σ = 559424268. Its totient is φ = 256361280.

The previous prime is 385917811. The next prime is 385917817. The reversal of 385917813 is 318719583.

It can be written as a sum of positive squares in 2 ways, for example, as 222666084 + 163251729 = 14922^2 + 12777^2 .

It is not a de Polignac number, because 385917813 - 2¹ = 385917811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (385917811) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 73770 + ... + 78827.

It is an arithmetic number, because the mean of its divisors is an integer number (46618689).

Almost surely, 2^385917813 is an apocalyptic number.

It is an amenable number.

385917813 is a deficient number, since it is larger than the sum of its proper divisors (173506455).

385917813 is a wasteful number, since it uses less digits than its factorization.

385917813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152884 (or 152881 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 385917813 is about 19644.7909889619. The cubic root of 385917813 is about 728.0562621303.

The spelling of 385917813 in words is "three hundred eighty-five million, nine hundred seventeen thousand, eight hundred thirteen".