4789721 has 2 divisors, whose sum is σ = 4789722. Its totient is φ = 4789720.

The previous prime is 4789667. The next prime is 4789739. The reversal of 4789721 is 1279874.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4243600 + 546121 = 2060^2 + 739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4789721 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (4789621) 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 as a sum of consecutive naturals, namely, 2394860 + 2394861.

It is an arithmetic number, because the mean of its divisors is an integer number (2394861).

Almost surely, 2^4789721 is an apocalyptic number.

It is an amenable number.

4789721 is a deficient number, since it is larger than the sum of its proper divisors (1).

4789721 is an equidigital number, since it uses as much as digits as its factorization.

4789721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 38.

The square root of 4789721 is about 2188.5431227189. The cubic root of 4789721 is about 168.5660352784.

The spelling of 4789721 in words is "four million, seven hundred eighty-nine thousand, seven hundred twenty-one".