384999409 has 2 divisors, whose sum is σ = 384999410. Its totient is φ = 384999408.

The previous prime is 384999403. The next prime is 384999431. The reversal of 384999409 is 904999483.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 306145009 + 78854400 = 17497^2 + 8880^2 .

It is a cyclic number.

It is not a de Polignac number, because 384999409 - 2²⁷ = 250781681 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 384999409.

It is not a weakly prime, because it can be changed into another prime (384999403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192499704 + 192499705.

It is an arithmetic number, because the mean of its divisors is an integer number (192499705).

Almost surely, 2^384999409 is an apocalyptic number.

It is an amenable number.

384999409 is a deficient number, since it is larger than the sum of its proper divisors (1).

384999409 is an equidigital number, since it uses as much as digits as its factorization.

384999409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2519424, while the sum is 55.

The square root of 384999409 is about 19621.4018102683. The cubic root of 384999409 is about 727.4782626366.

The spelling of 384999409 in words is "three hundred eighty-four million, nine hundred ninety-nine thousand, four hundred nine".