4721857 has 4 divisors (see below), whose sum is σ = 5396416. Its totient is φ = 4047300.

The previous prime is 4721839. The next prime is 4721879. The reversal of 4721857 is 7581274.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4721857 - 2⁷ = 4721729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4721887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 337269 + ... + 337282.

It is an arithmetic number, because the mean of its divisors is an integer number (1349104).

Almost surely, 2^4721857 is an apocalyptic number.

It is an amenable number.

4721857 is a deficient number, since it is larger than the sum of its proper divisors (674559).

4721857 is an equidigital number, since it uses as much as digits as its factorization.

4721857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 674558.

The product of its digits is 15680, while the sum is 34.

The square root of 4721857 is about 2172.9834329787. The cubic root of 4721857 is about 167.7661262938.

It can be divided in two parts, 47 and 21857, that added together give a square (21904 = 148²).

The spelling of 4721857 in words is "four million, seven hundred twenty-one thousand, eight hundred fifty-seven".