285977 has 2 divisors, whose sum is σ = 285978. Its totient is φ = 285976.

The previous prime is 285953. The next prime is 285979. The reversal of 285977 is 779582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 259081 + 26896 = 509^2 + 164^2 .

It is a cyclic number.

It is not a de Polignac number, because 285977 - 2⁸ = 285721 is a prime.

Together with 285979, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 285977.

It is not a weakly prime, because it can be changed into another prime (285979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142988 + 142989.

It is an arithmetic number, because the mean of its divisors is an integer number (142989).

2²⁸⁵⁹⁷⁷ is an apocalyptic number.

It is an amenable number.

285977 is a deficient number, since it is larger than the sum of its proper divisors (1).

285977 is an equidigital number, since it uses as much as digits as its factorization.

285977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35280, while the sum is 38.

The square root of 285977 is about 534.7681740717. The cubic root of 285977 is about 65.8835565413.

The spelling of 285977 in words is "two hundred eighty-five thousand, nine hundred seventy-seven".