385503857 has 2 divisors, whose sum is σ = 385503858. Its totient is φ = 385503856.

The previous prime is 385503847. The next prime is 385503919. The reversal of 385503857 is 758305583.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 269747776 + 115756081 = 16424^2 + 10759^2 .

It is a cyclic number.

It is not a de Polignac number, because 385503857 - 2¹⁰ = 385502833 is a prime.

It is a super-2 number, since 2×385503857² = 297226447523752898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (385503827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192751928 + 192751929.

It is an arithmetic number, because the mean of its divisors is an integer number (192751929).

Almost surely, 2^385503857 is an apocalyptic number.

It is an amenable number.

385503857 is a deficient number, since it is larger than the sum of its proper divisors (1).

385503857 is an equidigital number, since it uses as much as digits as its factorization.

385503857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504000, while the sum is 44.

The square root of 385503857 is about 19634.2521375274. The cubic root of 385503857 is about 727.7958516905.

The spelling of 385503857 in words is "three hundred eighty-five million, five hundred three thousand, eight hundred fifty-seven".