384864021 has 16 divisors (see below), whose sum is σ = 579835200. Its totient is φ = 252226224.

The previous prime is 384864001. The next prime is 384864023. The reversal of 384864021 is 120468483.

384864021 is a `hidden beast` number, since 3 + 8 + 4 + 8 + 640 + 2 + 1 = 666.

It is not a de Polignac number, because 384864021 - 2⁵ = 384863989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (384864023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119206 + ... + 122391.

It is an arithmetic number, because the mean of its divisors is an integer number (36239700).

Almost surely, 2^384864021 is an apocalyptic number.

It is an amenable number.

384864021 is a deficient number, since it is larger than the sum of its proper divisors (194971179).

384864021 is a wasteful number, since it uses less digits than its factorization.

384864021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241665 (or 241659 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 384864021 is about 19617.9514985638. The cubic root of 384864021 is about 727.3929781989.

The spelling of 384864021 in words is "three hundred eighty-four million, eight hundred sixty-four thousand, twenty-one".