385997893 has 2 divisors, whose sum is σ = 385997894. Its totient is φ = 385997892.

The previous prime is 385997879. The next prime is 385997929. The reversal of 385997893 is 398799583.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 325189089 + 60808804 = 18033^2 + 7798^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-385997893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (385997803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192998946 + 192998947.

It is an arithmetic number, because the mean of its divisors is an integer number (192998947).

Almost surely, 2^385997893 is an apocalyptic number.

It is an amenable number.

385997893 is a deficient number, since it is larger than the sum of its proper divisors (1).

385997893 is an equidigital number, since it uses as much as digits as its factorization.

385997893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14696640, while the sum is 61.

The square root of 385997893 is about 19646.8290825772. The cubic root of 385997893 is about 728.1066171638.

The spelling of 385997893 in words is "three hundred eighty-five million, nine hundred ninety-seven thousand, eight hundred ninety-three".