385465221 has 6 divisors (see below), whose sum is σ = 556783110. Its totient is φ = 256976808.

The previous prime is 385465219. The next prime is 385465309. The reversal of 385465221 is 122564583.

It can be written as a sum of positive squares in only one way, i.e., 268500996 + 116964225 = 16386^2 + 10815^2 .

It is not a de Polignac number, because 385465221 - 2¹ = 385465219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (385465621) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21414726 + ... + 21414743.

It is an arithmetic number, because the mean of its divisors is an integer number (92797185).

Almost surely, 2^385465221 is an apocalyptic number.

It is an amenable number.

385465221 is a deficient number, since it is larger than the sum of its proper divisors (171317889).

385465221 is a wasteful number, since it uses less digits than its factorization.

385465221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42829475 (or 42829472 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 385465221 is about 19633.2682200392. The cubic root of 385465221 is about 727.7715371391.

The spelling of 385465221 in words is "three hundred eighty-five million, four hundred sixty-five thousand, two hundred twenty-one".