383685681 has 4 divisors (see below), whose sum is σ = 511580912. Its totient is φ = 255790452.

The previous prime is 383685661. The next prime is 383685683. The reversal of 383685681 is 186586383.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 383685681 - 2¹¹ = 383683633 is a prime.

It is a super-2 number, since 2×383685681² = 294429403608867522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 383685681.

It is not an unprimeable number, because it can be changed into a prime (383685683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63947611 + ... + 63947616.

It is an arithmetic number, because the mean of its divisors is an integer number (127895228).

Almost surely, 2^383685681 is an apocalyptic number.

It is an amenable number.

383685681 is a deficient number, since it is larger than the sum of its proper divisors (127895231).

383685681 is a wasteful number, since it uses less digits than its factorization.

383685681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127895230.

The product of its digits is 829440, while the sum is 48.

The square root of 383685681 is about 19587.8962882694. The cubic root of 383685681 is about 726.6498651064.

The spelling of 383685681 in words is "three hundred eighty-three million, six hundred eighty-five thousand, six hundred eighty-one".