287749 has 16 divisors (see below), whose sum is σ = 372096. Its totient is φ = 216000.

The previous prime is 287747. The next prime is 287783. The reversal of 287749 is 947782.

It is a happy number.

287749 is nontrivially palindromic in base 6.

It is a cyclic number.

It is not a de Polignac number, because 287749 - 2¹ = 287747 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a deceptive number, since it divides R₂₈₇₇₄₈.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287747) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2799 + ... + 2899.

It is an arithmetic number, because the mean of its divisors is an integer number (23256).

2²⁸⁷⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

287749 is a deficient number, since it is larger than the sum of its proper divisors (84347).

287749 is a wasteful number, since it uses less digits than its factorization.

287749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156.

The product of its digits is 28224, while the sum is 37.

The square root of 287749 is about 536.4224081822. The cubic root of 287749 is about 66.0193545930.

287749 divided by its sum of digits (37) gives a palindrome (7777).

It can be divided in two parts, 2877 and 49, that added together give a triangular number (2926 = T₇₆).

The spelling of 287749 in words is "two hundred eighty-seven thousand, seven hundred forty-nine".