4957821 has 16 divisors (see below), whose sum is σ = 8013120. Its totient is φ = 3004560.

The previous prime is 4957819. The next prime is 4957837. The reversal of 4957821 is 1287594.

It is not a de Polignac number, because 4957821 - 2¹ = 4957819 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4957801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8050 + ... + 8643.

It is an arithmetic number, because the mean of its divisors is an integer number (500820).

Almost surely, 2^4957821 is an apocalyptic number.

It is an amenable number.

4957821 is a deficient number, since it is larger than the sum of its proper divisors (3055299).

4957821 is a wasteful number, since it uses less digits than its factorization.

4957821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16713 (or 16707 counting only the distinct ones).

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

The square root of 4957821 is about 2226.6164914506. The cubic root of 4957821 is about 170.5154023862.

It can be divided in two parts, 4957 and 821, that added together give a triangular number (5778 = T₁₀₇).

The spelling of 4957821 in words is "four million, nine hundred fifty-seven thousand, eight hundred twenty-one".