381821683 has 4 divisors (see below), whose sum is σ = 404281800. Its totient is φ = 359361568.

The previous prime is 381821669. The next prime is 381821719. The reversal of 381821683 is 386128183.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 381821683 - 2⁵ = 381821651 is a prime.

It is a Smith number, since the sum of its digits (40) 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 (381821633) 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, 11230033 + ... + 11230066.

It is an arithmetic number, because the mean of its divisors is an integer number (101070450).

Almost surely, 2^381821683 is an apocalyptic number.

381821683 is a deficient number, since it is larger than the sum of its proper divisors (22460117).

381821683 is a wasteful number, since it uses less digits than its factorization.

381821683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22460116.

The product of its digits is 55296, while the sum is 40.

The square root of 381821683 is about 19540.2580075085. The cubic root of 381821683 is about 725.4712326053.

The spelling of 381821683 in words is "three hundred eighty-one million, eight hundred twenty-one thousand, six hundred eighty-three".