384744821 has 8 divisors (see below), whose sum is σ = 393601560. Its totient is φ = 375985152.

The previous prime is 384744803. The next prime is 384744839. The reversal of 384744821 is 128447483.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (384744803) and next prime (384744839).

It can be written as a sum of positive squares in 4 ways, for example, as 23174596 + 361570225 = 4814^2 + 19015^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 384744821 - 2¹⁴ = 384728437 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 (384744881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16220 + ... + 32133.

It is an arithmetic number, because the mean of its divisors is an integer number (49200195).

Almost surely, 2^384744821 is an apocalyptic number.

It is an amenable number.

384744821 is a deficient number, since it is larger than the sum of its proper divisors (8856739).

384744821 is a wasteful number, since it uses less digits than its factorization.

384744821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48535.

The product of its digits is 172032, while the sum is 41.

The square root of 384744821 is about 19614.9132294792. The cubic root of 384744821 is about 727.3178744469.

The spelling of 384744821 in words is "three hundred eighty-four million, seven hundred forty-four thousand, eight hundred twenty-one".