381821023 has 2 divisors, whose sum is σ = 381821024. Its totient is φ = 381821022.

The previous prime is 381820991. The next prime is 381821039. The reversal of 381821023 is 320128183.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 381821023 - 2⁵ = 381820991 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 381820982 and 381821000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381821423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190910511 + 190910512.

It is an arithmetic number, because the mean of its divisors is an integer number (190910512).

Almost surely, 2^381821023 is an apocalyptic number.

381821023 is a deficient number, since it is larger than the sum of its proper divisors (1).

381821023 is an equidigital number, since it uses as much as digits as its factorization.

381821023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 381821023 is about 19540.2411192902. The cubic root of 381821023 is about 725.4708145993.

The spelling of 381821023 in words is "three hundred eighty-one million, eight hundred twenty-one thousand, twenty-three".