4857921 has 8 divisors (see below), whose sum is σ = 7196960. Its totient is φ = 3238596.

The previous prime is 4857893. The next prime is 4857943. The reversal of 4857921 is 1297584.

It is not a de Polignac number, because 4857921 - 2¹⁹ = 4333633 is a prime.

It is a Duffinian number.

4857921 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (4857221) 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, 89935 + ... + 89988.

It is an arithmetic number, because the mean of its divisors is an integer number (899620).

Almost surely, 2^4857921 is an apocalyptic number.

It is an amenable number.

4857921 is a deficient number, since it is larger than the sum of its proper divisors (2339039).

4857921 is a wasteful number, since it uses less digits than its factorization.

4857921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179932 (or 179926 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 4857921 is about 2204.0691912914. The cubic root of 4857921 is about 169.3623284956.

It can be divided in two parts, 4857 and 921, that added together give a triangular number (5778 = T₁₀₇).

The spelling of 4857921 in words is "four million, eight hundred fifty-seven thousand, nine hundred twenty-one".