385665870 has 16 divisors (see below), whose sum is σ = 925598160. Its totient is φ = 102844224.

The previous prime is 385665829. The next prime is 385665901. The reversal of 385665870 is 78566583.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6427735 + ... + 6427794.

It is an arithmetic number, because the mean of its divisors is an integer number (57849885).

Almost surely, 2^385665870 is an apocalyptic number.

385665870 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

385665870 is an abundant number, since it is smaller than the sum of its proper divisors (539932290).

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

385665870 is a wasteful number, since it uses less digits than its factorization.

385665870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12855539.

The product of its (nonzero) digits is 1209600, while the sum is 48.

The square root of 385665870 is about 19638.3774788041. The cubic root of 385665870 is about 727.8977926291.

The spelling of 385665870 in words is "three hundred eighty-five million, six hundred sixty-five thousand, eight hundred seventy".