381856829 has 2 divisors, whose sum is σ = 381856830. Its totient is φ = 381856828.

The previous prime is 381856799. The next prime is 381856831. The reversal of 381856829 is 928658183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 327067225 + 54789604 = 18085^2 + 7402^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381856829 is a prime.

It is a Sophie Germain prime.

Together with 381856831, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381852829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190928414 + 190928415.

It is an arithmetic number, because the mean of its divisors is an integer number (190928415).

Almost surely, 2^381856829 is an apocalyptic number.

It is an amenable number.

381856829 is a deficient number, since it is larger than the sum of its proper divisors (1).

381856829 is an equidigital number, since it uses as much as digits as its factorization.

381856829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 829440, while the sum is 50.

The square root of 381856829 is about 19541.1573096375. The cubic root of 381856829 is about 725.4934913636.

The spelling of 381856829 in words is "three hundred eighty-one million, eight hundred fifty-six thousand, eight hundred twenty-nine".