384442621 has 2 divisors, whose sum is σ = 384442622. Its totient is φ = 384442620.

The previous prime is 384442579. The next prime is 384442651. The reversal of 384442621 is 126244483.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 378730521 + 5712100 = 19461^2 + 2390^2 .

It is a cyclic number.

It is not a de Polignac number, because 384442621 - 2²³ = 376054013 is a prime.

It is a super-2 number, since 2×384442621² = 295592257682699282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (384442651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192221310 + 192221311.

It is an arithmetic number, because the mean of its divisors is an integer number (192221311).

Almost surely, 2^384442621 is an apocalyptic number.

It is an amenable number.

384442621 is a deficient number, since it is larger than the sum of its proper divisors (1).

384442621 is an equidigital number, since it uses as much as digits as its factorization.

384442621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36864, while the sum is 34.

The square root of 384442621 is about 19607.2083938535. The cubic root of 384442621 is about 727.1273992528.

The spelling of 384442621 in words is "three hundred eighty-four million, four hundred forty-two thousand, six hundred twenty-one".