4221857 has 8 divisors (see below), whose sum is σ = 4637760. Its totient is φ = 3825360.

The previous prime is 4221851. The next prime is 4221883. The reversal of 4221857 is 7581224.

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

It is not a de Polignac number, because 4221857 - 2¹² = 4217761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4221851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4394 + ... + 5267.

It is an arithmetic number, because the mean of its divisors is an integer number (579720).

Almost surely, 2^4221857 is an apocalyptic number.

It is an amenable number.

4221857 is a deficient number, since it is larger than the sum of its proper divisors (415903).

4221857 is a wasteful number, since it uses less digits than its factorization.

4221857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9703.

The product of its digits is 4480, while the sum is 29.

The square root of 4221857 is about 2054.7157954325. The cubic root of 4221857 is about 161.6222591508.

The spelling of 4221857 in words is "four million, two hundred twenty-one thousand, eight hundred fifty-seven".