287212 has 12 divisors (see below), whose sum is σ = 511560. Its totient is φ = 141056.

The previous prime is 287191. The next prime is 287219. The reversal of 287212 is 212782.

It is a d-powerful number, because it can be written as 2² + 8² + 2¹³ + 7⁵ + 1 + 2¹⁸ .

It is not an unprimeable number, because it can be changed into a prime (287219) by changing a digit.

287212 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 373 + ... + 844.

It is an arithmetic number, because the mean of its divisors is an integer number (42630).

2²⁸⁷²¹² is an apocalyptic number.

It is an amenable number.

287212 is a deficient number, since it is larger than the sum of its proper divisors (224348).

287212 is a wasteful number, since it uses less digits than its factorization.

287212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280 (or 1278 counting only the distinct ones).

The product of its digits is 448, while the sum is 22.

The square root of 287212 is about 535.9216360626. The cubic root of 287212 is about 65.9782603637.

Adding to 287212 its reverse (212782), we get a palindrome (499994).

The spelling of 287212 in words is "two hundred eighty-seven thousand, two hundred twelve".