287431 has 4 divisors (see below), whose sum is σ = 299952. Its totient is φ = 274912.

The previous prime is 287393. The next prime is 287437. The reversal of 287431 is 134782.

287431 = T₈₈ + T₈₉ + ... + T₁₃₃.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134782 = 2 ⋅67391.

It is a cyclic number.

It is not a de Polignac number, because 287431 - 2¹⁵ = 254663 is a prime.

It is a super-2 number, since 2×287431² = 165233159522, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

287431 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 287396 and 287405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6226 + ... + 6271.

It is an arithmetic number, because the mean of its divisors is an integer number (74988).

2²⁸⁷⁴³¹ is an apocalyptic number.

287431 is a deficient number, since it is larger than the sum of its proper divisors (12521).

287431 is a wasteful number, since it uses less digits than its factorization.

287431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12520.

The product of its digits is 1344, while the sum is 25.

The square root of 287431 is about 536.1259180454. The cubic root of 287431 is about 65.9950256429.

The spelling of 287431 in words is "two hundred eighty-seven thousand, four hundred thirty-one".