4938821 has 4 divisors (see below), whose sum is σ = 4949952. Its totient is φ = 4927692.

The previous prime is 4938779. The next prime is 4938833. The reversal of 4938821 is 1288394.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1288394 = 2 ⋅644197.

It is a cyclic number.

It is not a de Polignac number, because 4938821 - 2¹⁰ = 4937797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4938881) 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 3 ways as a sum of consecutive naturals, for example, 4871 + ... + 5796.

It is an arithmetic number, because the mean of its divisors is an integer number (1237488).

Almost surely, 2^4938821 is an apocalyptic number.

It is an amenable number.

4938821 is a deficient number, since it is larger than the sum of its proper divisors (11131).

4938821 is a wasteful number, since it uses less digits than its factorization.

4938821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11130.

The product of its digits is 13824, while the sum is 35.

The square root of 4938821 is about 2222.3458326732. The cubic root of 4938821 is about 170.2972998414.

The spelling of 4938821 in words is "four million, nine hundred thirty-eight thousand, eight hundred twenty-one".