385918921 has 12 divisors (see below), whose sum is σ = 423211932. Its totient is φ = 350680064.

The previous prime is 385918891. The next prime is 385918943. The reversal of 385918921 is 129819583.

It can be written as a sum of positive squares in 6 ways, for example, as 4888521 + 381030400 = 2211^2 + 19520^2 .

It is not a de Polignac number, because 385918921 - 2⁵ = 385918889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (385918021) 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, 801 + ... + 27793.

It is an arithmetic number, because the mean of its divisors is an integer number (35267661).

Almost surely, 2^385918921 is an apocalyptic number.

It is an amenable number.

385918921 is a deficient number, since it is larger than the sum of its proper divisors (37293011).

385918921 is a wasteful number, since it uses less digits than its factorization.

385918921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27068 (or 27039 counting only the distinct ones).

The product of its digits is 155520, while the sum is 46.

The square root of 385918921 is about 19644.8191898017. The cubic root of 385918921 is about 728.0569588983.

The spelling of 385918921 in words is "three hundred eighty-five million, nine hundred eighteen thousand, nine hundred twenty-one".