384938509 has 2 divisors, whose sum is σ = 384938510. Its totient is φ = 384938508.

The previous prime is 384938453. The next prime is 384938513. The reversal of 384938509 is 905839483.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 379392484 + 5546025 = 19478^2 + 2355^2 .

It is a cyclic number.

It is not a de Polignac number, because 384938509 - 2¹⁹ = 384414221 is a prime.

It is a super-2 number, since 2×384938509² = 296355311422286162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (384938539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192469254 + 192469255.

It is an arithmetic number, because the mean of its divisors is an integer number (192469255).

Almost surely, 2^384938509 is an apocalyptic number.

It is an amenable number.

384938509 is a deficient number, since it is larger than the sum of its proper divisors (1).

384938509 is an equidigital number, since it uses as much as digits as its factorization.

384938509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 933120, while the sum is 49.

The square root of 384938509 is about 19619.8498720046. The cubic root of 384938509 is about 727.4399026103.

The spelling of 384938509 in words is "three hundred eighty-four million, nine hundred thirty-eight thousand, five hundred nine".