381890221 has 8 divisors (see below), whose sum is σ = 387192960. Its totient is φ = 376604352.

The previous prime is 381890207. The next prime is 381890233. The reversal of 381890221 is 122098183.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 381890221 - 2¹¹ = 381888173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381890251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45340 + ... + 53098.

It is an arithmetic number, because the mean of its divisors is an integer number (48399120).

Almost surely, 2^381890221 is an apocalyptic number.

It is an amenable number.

381890221 is a deficient number, since it is larger than the sum of its proper divisors (5302739).

381890221 is an equidigital number, since it uses as much as digits as its factorization.

381890221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8435.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 381890221 is about 19542.0116927608. The cubic root of 381890221 is about 725.5146380087.

The spelling of 381890221 in words is "three hundred eighty-one million, eight hundred ninety thousand, two hundred twenty-one".