420287 has 4 divisors (see below), whose sum is σ = 480336. Its totient is φ = 360240.

The previous prime is 420271. The next prime is 420293. The reversal of 420287 is 782024.

420287 = T₂₃₈ + T₂₃₉ + ... + T₂₅₁.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 420287 - 2⁴ = 420271 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 420287.

It is not an unprimeable number, because it can be changed into a prime (422287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30014 + ... + 30027.

It is an arithmetic number, because the mean of its divisors is an integer number (120084).

2⁴²⁰²⁸⁷ is an apocalyptic number.

420287 is a deficient number, since it is larger than the sum of its proper divisors (60049).

420287 is an equidigital number, since it uses as much as digits as its factorization.

420287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60048.

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 420287 is about 648.2954573341. The cubic root of 420287 is about 74.9057779753.

It can be divided in two parts, 420 and 287, that added together give a palindrome (707).

The spelling of 420287 in words is "four hundred twenty thousand, two hundred eighty-seven".