384020921 has 4 divisors (see below), whose sum is σ = 384630144. Its totient is φ = 383411700.

The previous prime is 384020909. The next prime is 384020927. The reversal of 384020921 is 129020483.

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 384020921 - 2²² = 379826617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (384020927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 303665 + ... + 304926.

It is an arithmetic number, because the mean of its divisors is an integer number (96157536).

Almost surely, 2^384020921 is an apocalyptic number.

It is an amenable number.

384020921 is a deficient number, since it is larger than the sum of its proper divisors (609223).

384020921 is an equidigital number, since it uses as much as digits as its factorization.

384020921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609222.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 384020921 is about 19596.4517451502. The cubic root of 384020921 is about 726.8614368862.

The spelling of 384020921 in words is "three hundred eighty-four million, twenty thousand, nine hundred twenty-one".