385817890 has 32 divisors (see below), whose sum is σ = 737961840. Its totient is φ = 145230592.

The previous prime is 385817837. The next prime is 385817891. The reversal of 385817890 is 98718583.

It can be written as a sum of positive squares in 8 ways, for example, as 71216721 + 314601169 = 8439^2 + 17737^2 .

It is not an unprimeable number, because it can be changed into a prime (385817891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45204 + ... + 53056.

Almost surely, 2^385817890 is an apocalyptic number.

385817890 is a deficient number, since it is larger than the sum of its proper divisors (352143950).

385817890 is an equidigital number, since it uses as much as digits as its factorization.

385817890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7911 (or 7877 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 49.

The square root of 385817890 is about 19642.2475801523. The cubic root of 385817890 is about 727.9934198677.

The spelling of 385817890 in words is "three hundred eighty-five million, eight hundred seventeen thousand, eight hundred ninety".