384391421 has 8 divisors (see below), whose sum is σ = 388260984. Its totient is φ = 380540160.

The previous prime is 384391417. The next prime is 384391429. The reversal of 384391421 is 124193483.

It can be written as a sum of positive squares in 4 ways, for example, as 153016900 + 231374521 = 12370^2 + 15211^2 .

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 384391421 - 2² = 384391417 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 (384391429) 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, 39761 + ... + 48473.

It is an arithmetic number, because the mean of its divisors is an integer number (48532623).

Almost surely, 2^384391421 is an apocalyptic number.

It is an amenable number.

384391421 is a deficient number, since it is larger than the sum of its proper divisors (3869563).

384391421 is a wasteful number, since it uses less digits than its factorization.

384391421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9151.

The product of its digits is 20736, while the sum is 35.

The square root of 384391421 is about 19605.9027081132. The cubic root of 384391421 is about 727.0951182537.

The spelling of 384391421 in words is "three hundred eighty-four million, three hundred ninety-one thousand, four hundred twenty-one".