285985939 has 2 divisors, whose sum is σ = 285985940. Its totient is φ = 285985938.

The previous prime is 285985919. The next prime is 285985957. The reversal of 285985939 is 939589582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 285985939 - 2⁷ = 285985811 is a prime.

It is not a weakly prime, because it can be changed into another prime (285985919) 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, 142992969 + 142992970.

It is an arithmetic number, because the mean of its divisors is an integer number (142992970).

Almost surely, 2^285985939 is an apocalyptic number.

285985939 is a deficient number, since it is larger than the sum of its proper divisors (1).

285985939 is an equidigital number, since it uses as much as digits as its factorization.

285985939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6998400, while the sum is 58.

The square root of 285985939 is about 16911.1187979980. The cubic root of 285985939 is about 658.8424299154.

The spelling of 285985939 in words is "two hundred eighty-five million, nine hundred eighty-five thousand, nine hundred thirty-nine".