385308709 has 2 divisors, whose sum is σ = 385308710. Its totient is φ = 385308708.

The previous prime is 385308661. The next prime is 385308727. The reversal of 385308709 is 907803583.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 285508609 + 99800100 = 16897^2 + 9990^2 .

It is a cyclic number.

It is not a de Polignac number, because 385308709 - 2⁹ = 385308197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (385308739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192654354 + 192654355.

It is an arithmetic number, because the mean of its divisors is an integer number (192654355).

Almost surely, 2^385308709 is an apocalyptic number.

It is an amenable number.

385308709 is a deficient number, since it is larger than the sum of its proper divisors (1).

385308709 is an equidigital number, since it uses as much as digits as its factorization.

385308709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 385308709 is about 19629.2819277731. The cubic root of 385308709 is about 727.6730237995.

The spelling of 385308709 in words is "three hundred eighty-five million, three hundred eight thousand, seven hundred nine".