384204821 has 16 divisors (see below), whose sum is σ = 515856768. Its totient is φ = 276350400.

The previous prime is 384204787. The next prime is 384204829. The reversal of 384204821 is 128402483.

It is a cyclic number.

It is not a de Polignac number, because 384204821 - 2¹⁰ = 384203797 is a prime.

It is a super-2 number, since 2×384204821² = 295226688959284082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (384204829) 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, 190910 + ... + 192911.

It is an arithmetic number, because the mean of its divisors is an integer number (32241048).

Almost surely, 2^384204821 is an apocalyptic number.

It is an amenable number.

384204821 is a deficient number, since it is larger than the sum of its proper divisors (131651947).

384204821 is a wasteful number, since it uses less digits than its factorization.

384204821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383852.

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 384204821 is about 19601.1433595084. The cubic root of 384204821 is about 726.9774448772.

The spelling of 384204821 in words is "three hundred eighty-four million, two hundred four thousand, eight hundred twenty-one".