385221891 has 8 divisors (see below), whose sum is σ = 513722704. Its totient is φ = 256767840.

The previous prime is 385221869. The next prime is 385221901. The reversal of 385221891 is 198122583.

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

It is not a de Polignac number, because 385221891 - 2⁹ = 385221379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (385221091) 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 7 ways as a sum of consecutive naturals, for example, 19185 + ... + 33741.

It is an arithmetic number, because the mean of its divisors is an integer number (64215338).

Almost surely, 2^385221891 is an apocalyptic number.

385221891 is a deficient number, since it is larger than the sum of its proper divisors (128500813).

385221891 is a wasteful number, since it uses less digits than its factorization.

385221891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23381.

The product of its digits is 34560, while the sum is 39.

The square root of 385221891 is about 19627.0703621300. The cubic root of 385221891 is about 727.6183664467.

The spelling of 385221891 in words is "three hundred eighty-five million, two hundred twenty-one thousand, eight hundred ninety-one".