4490921 has 2 divisors, whose sum is σ = 4490922. Its totient is φ = 4490920.

The previous prime is 4490879. The next prime is 4490933. The reversal of 4490921 is 1290944.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2706025 + 1784896 = 1645^2 + 1336^2 .

It is a cyclic number.

It is not a de Polignac number, because 4490921 - 2¹⁰ = 4489897 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (4493921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2245460 + 2245461.

It is an arithmetic number, because the mean of its divisors is an integer number (2245461).

Almost surely, 2^4490921 is an apocalyptic number.

It is an amenable number.

4490921 is a deficient number, since it is larger than the sum of its proper divisors (1).

4490921 is an equidigital number, since it uses as much as digits as its factorization.

4490921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 4490921 is about 2119.1793222849. The cubic root of 4490921 is about 164.9852573299.

The spelling of 4490921 in words is "four million, four hundred ninety thousand, nine hundred twenty-one".