285007729 has 2 divisors, whose sum is σ = 285007730. Its totient is φ = 285007728.

The previous prime is 285007691. The next prime is 285007753. The reversal of 285007729 is 927700582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 219721329 + 65286400 = 14823^2 + 8080^2 .

It is a cyclic number.

It is not a de Polignac number, because 285007729 - 2¹³ = 284999537 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 285007691 and 285007700.

It is not a weakly prime, because it can be changed into another prime (285007529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142503864 + 142503865.

It is an arithmetic number, because the mean of its divisors is an integer number (142503865).

Almost surely, 2^285007729 is an apocalyptic number.

It is an amenable number.

285007729 is a deficient number, since it is larger than the sum of its proper divisors (1).

285007729 is an equidigital number, since it uses as much as digits as its factorization.

285007729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 285007729 is about 16882.1719278060. The cubic root of 285007729 is about 658.0903853997.

The spelling of 285007729 in words is "two hundred eighty-five million, seven thousand, seven hundred twenty-nine".