384386681 has 16 divisors (see below), whose sum is σ = 447530880. Its totient is φ = 323326080.

The previous prime is 384386669. The next prime is 384386689. The reversal of 384386681 is 186683483.

It is a de Polignac number, because none of the positive numbers 2^k-384386681 is a prime.

It is a super-2 number, since 2×384386681² = 295506241060391522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (384386689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 262730 + ... + 264188.

It is an arithmetic number, because the mean of its divisors is an integer number (27970680).

Almost surely, 2^384386681 is an apocalyptic number.

It is an amenable number.

384386681 is a deficient number, since it is larger than the sum of its proper divisors (63144199).

384386681 is a wasteful number, since it uses less digits than its factorization.

384386681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2144.

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

The square root of 384386681 is about 19605.7818257778. The cubic root of 384386681 is about 727.0921295944.

The spelling of 384386681 in words is "three hundred eighty-four million, three hundred eighty-six thousand, six hundred eighty-one".