385321566 has 64 divisors (see below), whose sum is σ = 903260160. Its totient is φ = 107309280.

The previous prime is 385321543. The next prime is 385321571. The reversal of 385321566 is 665123583.

385321566 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 324025 + ... + 325211.

It is an arithmetic number, because the mean of its divisors is an integer number (14113440).

Almost surely, 2^385321566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 385321566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (451630080).

385321566 is an abundant number, since it is smaller than the sum of its proper divisors (517938594).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

385321566 is a wasteful number, since it uses less digits than its factorization.

385321566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1389.

The product of its digits is 129600, while the sum is 39.

The square root of 385321566 is about 19629.6094204648. The cubic root of 385321566 is about 727.6811173859.

The spelling of 385321566 in words is "three hundred eighty-five million, three hundred twenty-one thousand, five hundred sixty-six".