384809621 has 4 divisors (see below), whose sum is σ = 439782432. Its totient is φ = 329836812.

The previous prime is 384809597. The next prime is 384809629. The reversal of 384809621 is 126908483.

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 384809621 - 2¹⁰ = 384808597 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 (384809629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27486395 + ... + 27486408.

It is an arithmetic number, because the mean of its divisors is an integer number (109945608).

Almost surely, 2^384809621 is an apocalyptic number.

It is an amenable number.

384809621 is a deficient number, since it is larger than the sum of its proper divisors (54972811).

384809621 is an equidigital number, since it uses as much as digits as its factorization.

384809621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54972810.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 384809621 is about 19616.5649643356. The cubic root of 384809621 is about 727.3587045850.

The spelling of 384809621 in words is "three hundred eighty-four million, eight hundred nine thousand, six hundred twenty-one".