287869 has 8 divisors (see below), whose sum is σ = 308000. Its totient is φ = 268272.

The previous prime is 287867. The next prime is 287873. The reversal of 287869 is 968782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 6-Lehmer number, since φ(287869) divides (287869-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 287869 - 2¹ = 287867 is a prime.

It is a super-2 number, since 2×287869² = 165737122322, which contains 22 as substring.

It is a Duffinian number.

287869 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2002 + ... + 2140.

It is an arithmetic number, because the mean of its divisors is an integer number (38500).

2²⁸⁷⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

287869 is a deficient number, since it is larger than the sum of its proper divisors (20131).

287869 is a wasteful number, since it uses less digits than its factorization.

287869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267.

The product of its digits is 48384, while the sum is 40.

The square root of 287869 is about 536.5342486738. The cubic root of 287869 is about 66.0285306707.

It can be divided in two parts, 287 and 869, that added together give a square (1156 = 34²).

The spelling of 287869 in words is "two hundred eighty-seven thousand, eight hundred sixty-nine".