4287821 has 8 divisors (see below), whose sum is σ = 4584384. Its totient is φ = 4000480.

The previous prime is 4287809. The next prime is 4287823. The reversal of 4287821 is 1287824.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4287821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4287823) 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 7 ways as a sum of consecutive naturals, for example, 1331 + ... + 3216.

It is an arithmetic number, because the mean of its divisors is an integer number (573048).

Almost surely, 2^4287821 is an apocalyptic number.

4287821 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

4287821 is a deficient number, since it is larger than the sum of its proper divisors (296563).

4287821 is a wasteful number, since it uses less digits than its factorization.

4287821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4611.

The product of its digits is 7168, while the sum is 32.

The square root of 4287821 is about 2070.7054353529. The cubic root of 4287821 is about 162.4596633610.

The spelling of 4287821 in words is "four million, two hundred eighty-seven thousand, eight hundred twenty-one".