285749 has 2 divisors, whose sum is σ = 285750. Its totient is φ = 285748.

The previous prime is 285731. The next prime is 285757. The reversal of 285749 is 947582.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168100 + 117649 = 410^2 + 343^2 .

It is a cyclic number.

It is not a de Polignac number, because 285749 - 2¹² = 281653 is a prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142874 + 142875.

It is an arithmetic number, because the mean of its divisors is an integer number (142875).

285749 is a Friedman number, since it can be written as (9+8)*(7^5+2)-4, using all its digits and the basic arithmetic operations.

2²⁸⁵⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

285749 is a deficient number, since it is larger than the sum of its proper divisors (1).

285749 is an equidigital number, since it uses as much as digits as its factorization.

285749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 35.

The square root of 285749 is about 534.5549550795. The cubic root of 285749 is about 65.8660429595.

The spelling of 285749 in words is "two hundred eighty-five thousand, seven hundred forty-nine".