385427509 has 2 divisors, whose sum is σ = 385427510. Its totient is φ = 385427508.

The previous prime is 385427479. The next prime is 385427563. The reversal of 385427509 is 905724583.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 320302609 + 65124900 = 17897^2 + 8070^2 .

It is a cyclic number.

It is not a de Polignac number, because 385427509 - 2⁹ = 385426997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (385427599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192713754 + 192713755.

It is an arithmetic number, because the mean of its divisors is an integer number (192713755).

Almost surely, 2^385427509 is an apocalyptic number.

It is an amenable number.

385427509 is a deficient number, since it is larger than the sum of its proper divisors (1).

385427509 is an equidigital number, since it uses as much as digits as its factorization.

385427509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 302400, while the sum is 43.

The square root of 385427509 is about 19632.3077858921. The cubic root of 385427509 is about 727.7478025160.

The spelling of 385427509 in words is "three hundred eighty-five million, four hundred twenty-seven thousand, five hundred nine".