385781738 has 16 divisors (see below), whose sum is σ = 614724000. Its totient is φ = 181060272.

The previous prime is 385781689. The next prime is 385781741. The reversal of 385781738 is 837187583.

It is a Curzon 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, 42428 + ... + 50711.

It is an arithmetic number, because the mean of its divisors is an integer number (38420250).

Almost surely, 2^385781738 is an apocalyptic number.

385781738 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

385781738 is a deficient number, since it is larger than the sum of its proper divisors (228942262).

385781738 is a wasteful number, since it uses less digits than its factorization.

385781738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93269.

The product of its digits is 1128960, while the sum is 50.

The square root of 385781738 is about 19641.3272973086. The cubic root of 385781738 is about 727.9706809530.

The spelling of 385781738 in words is "three hundred eighty-five million, seven hundred eighty-one thousand, seven hundred thirty-eight".