381820229 has 4 divisors (see below), whose sum is σ = 436365984. Its totient is φ = 327274476.

The previous prime is 381820223. The next prime is 381820237. The reversal of 381820229 is 922028183.

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 a cyclic number.

It is not a de Polignac number, because 381820229 - 2⁴ = 381820213 is a prime.

It is a super-2 number, since 2×381820229² = 291573374547224882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381820223) 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 in 3 ways as a sum of consecutive naturals, for example, 27272867 + ... + 27272880.

It is an arithmetic number, because the mean of its divisors is an integer number (109091496).

Almost surely, 2^381820229 is an apocalyptic number.

It is an amenable number.

381820229 is a deficient number, since it is larger than the sum of its proper divisors (54545755).

381820229 is an equidigital number, since it uses as much as digits as its factorization.

381820229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54545754.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 381820229 is about 19540.2208022325. The cubic root of 381820229 is about 725.4703117247.

The spelling of 381820229 in words is "three hundred eighty-one million, eight hundred twenty thousand, two hundred twenty-nine".