384070021 has 2 divisors, whose sum is σ = 384070022. Its totient is φ = 384070020.

The previous prime is 384070013. The next prime is 384070039. The reversal of 384070021 is 120070483.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 332661121 + 51408900 = 18239^2 + 7170^2 .

It is a cyclic number.

It is not a de Polignac number, because 384070021 - 2³ = 384070013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (384070061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192035010 + 192035011.

It is an arithmetic number, because the mean of its divisors is an integer number (192035011).

Almost surely, 2^384070021 is an apocalyptic number.

It is an amenable number.

384070021 is a deficient number, since it is larger than the sum of its proper divisors (1).

384070021 is an equidigital number, since it uses as much as digits as its factorization.

384070021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 384070021 is about 19597.7044829235. The cubic root of 384070021 is about 726.8924138232.

The spelling of 384070021 in words is "three hundred eighty-four million, seventy thousand, twenty-one".