4949821 has 4 divisors (see below), whose sum is σ = 4980352. Its totient is φ = 4919292.

The previous prime is 4949797. The next prime is 4949827. The reversal of 4949821 is 1289494.

It is a happy number.

4949821 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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: 1289494 = 2 ⋅644747.

It is a cyclic number.

It is not a de Polignac number, because 4949821 - 2²¹ = 2852669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4949827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15021 + ... + 15346.

It is an arithmetic number, because the mean of its divisors is an integer number (1245088).

Almost surely, 2^4949821 is an apocalyptic number.

4949821 is the 1285-th hex number.

It is an amenable number.

4949821 is a deficient number, since it is larger than the sum of its proper divisors (30531).

4949821 is a wasteful number, since it uses less digits than its factorization.

4949821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30530.

The product of its digits is 20736, while the sum is 37.

The square root of 4949821 is about 2224.8193185066. The cubic root of 4949821 is about 170.4236377716.

The spelling of 4949821 in words is "four million, nine hundred forty-nine thousand, eight hundred twenty-one".