287423 has 4 divisors (see below), whose sum is σ = 289080. Its totient is φ = 285768.

The previous prime is 287393. The next prime is 287437. The reversal of 287423 is 324782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 324782 = 2 ⋅162391.

It is a cyclic number.

It is not a de Polignac number, because 287423 - 2⁸ = 287167 is a prime.

It is a super-2 number, since 2×287423² = 165223961858, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 287392 and 287401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 533 + ... + 926.

It is an arithmetic number, because the mean of its divisors is an integer number (72270).

2²⁸⁷⁴²³ is an apocalyptic number.

287423 is a deficient number, since it is larger than the sum of its proper divisors (1657).

287423 is a wasteful number, since it uses less digits than its factorization.

287423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1656.

The product of its digits is 2688, while the sum is 26.

The square root of 287423 is about 536.1184570596. The cubic root of 287423 is about 65.9944133624.

The spelling of 287423 in words is "two hundred eighty-seven thousand, four hundred twenty-three".