286721 has 2 divisors, whose sum is σ = 286722. Its totient is φ = 286720.

The previous prime is 286711. The next prime is 286733. The reversal of 286721 is 127682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 261121 + 25600 = 511^2 + 160^2 .

It is a cyclic number.

It is not a de Polignac number, because 286721 - 2¹⁰ = 285697 is a prime.

It is a Chen prime.

It is equal to p₂₄₉₇₄ and since 286721 and 24974 have the same sum of digits, it is a Honaker prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 286721.

It is not a weakly prime, because it can be changed into another prime (286711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143360 + 143361.

It is an arithmetic number, because the mean of its divisors is an integer number (143361).

It is a Proth number, since it is equal to 35 ⋅ 2¹³ + 1 and 35 < 2¹³.

2²⁸⁶⁷²¹ is an apocalyptic number.

It is an amenable number.

286721 is a deficient number, since it is larger than the sum of its proper divisors (1).

286721 is an equidigital number, since it uses as much as digits as its factorization.

286721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 26.

The square root of 286721 is about 535.4633507533. The cubic root of 286721 is about 65.9406414577.

The spelling of 286721 in words is "two hundred eighty-six thousand, seven hundred twenty-one".