384638681 has 12 divisors (see below), whose sum is σ = 448362000. Its totient is φ = 329008680.

The previous prime is 384638627. The next prime is 384638689. The reversal of 384638681 is 186836483.

It is a de Polignac number, because none of the positive numbers 2^k-384638681 is a prime.

It is a super-2 number, since 2×384638681² = 295893829842839522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (384638689) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16586 + ... + 32316.

It is an arithmetic number, because the mean of its divisors is an integer number (37363500).

Almost surely, 2^384638681 is an apocalyptic number.

It is an amenable number.

384638681 is a deficient number, since it is larger than the sum of its proper divisors (63723319).

384638681 is a wasteful number, since it uses less digits than its factorization.

384638681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16244 (or 16237 counting only the distinct ones).

The product of its digits is 663552, while the sum is 47.

The square root of 384638681 is about 19612.2074484235. The cubic root of 384638681 is about 727.2509862871.

The spelling of 384638681 in words is "three hundred eighty-four million, six hundred thirty-eight thousand, six hundred eighty-one".