4909921 has 4 divisors (see below), whose sum is σ = 4993200. Its totient is φ = 4826644.

The previous prime is 4909871. The next prime is 4909939. The reversal of 4909921 is 1299094.

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.

It is a cyclic number.

It is not a de Polignac number, because 4909921 - 2⁹ = 4909409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4909981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41551 + ... + 41668.

It is an arithmetic number, because the mean of its divisors is an integer number (1248300).

Almost surely, 2^4909921 is an apocalyptic number.

It is an amenable number.

4909921 is a deficient number, since it is larger than the sum of its proper divisors (83279).

4909921 is an equidigital number, since it uses as much as digits as its factorization.

4909921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83278.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 4909921 is about 2215.8341544439. The cubic root of 4909921 is about 169.9644793145.

The spelling of 4909921 in words is "four million, nine hundred nine thousand, nine hundred twenty-one".