384979821 has 16 divisors (see below), whose sum is σ = 524321280. Its totient is φ = 251198640.

The previous prime is 384979801. The next prime is 384979849. The reversal of 384979821 is 128979483.

It is not a de Polignac number, because 384979821 - 2¹⁷ = 384848749 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (384979801) 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 15 ways as a sum of consecutive naturals, for example, 23106 + ... + 36108.

It is an arithmetic number, because the mean of its divisors is an integer number (32770080).

Almost surely, 2^384979821 is an apocalyptic number.

It is an amenable number.

384979821 is a deficient number, since it is larger than the sum of its proper divisors (139341459).

384979821 is a wasteful number, since it uses less digits than its factorization.

384979821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13216.

The product of its digits is 870912, while the sum is 51.

The square root of 384979821 is about 19620.9026550768. The cubic root of 384979821 is about 727.4659248810.

The spelling of 384979821 in words is "three hundred eighty-four million, nine hundred seventy-nine thousand, eight hundred twenty-one".