4819921 has 4 divisors (see below), whose sum is σ = 4825600. Its totient is φ = 4814244.

The previous prime is 4819909. The next prime is 4819937. The reversal of 4819921 is 1299184.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 4819921 - 2⁵ = 4819889 is a prime.

It is a super-3 number, since 3×4819921³ (a number of 21 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4819961) 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, 1281 + ... + 3358.

It is an arithmetic number, because the mean of its divisors is an integer number (1206400).

Almost surely, 2^4819921 is an apocalyptic number.

It is an amenable number.

4819921 is a deficient number, since it is larger than the sum of its proper divisors (5679).

4819921 is a wasteful number, since it uses less digits than its factorization.

4819921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5678.

The product of its digits is 5184, while the sum is 34.

The square root of 4819921 is about 2195.4318481793. The cubic root of 4819921 is about 168.9195723882.

The spelling of 4819921 in words is "four million, eight hundred nineteen thousand, nine hundred twenty-one".