4742809 has 2 divisors, whose sum is σ = 4742810. Its totient is φ = 4742808.

The previous prime is 4742753. The next prime is 4742821. The reversal of 4742809 is 9082474.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2576025 + 2166784 = 1605^2 + 1472^2 .

It is a cyclic number.

It is not a de Polignac number, because 4742809 - 2⁷ = 4742681 is a prime.

4742809 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (4742909) 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, 2371404 + 2371405.

It is an arithmetic number, because the mean of its divisors is an integer number (2371405).

Almost surely, 2^4742809 is an apocalyptic number.

It is an amenable number.

4742809 is a deficient number, since it is larger than the sum of its proper divisors (1).

4742809 is an equidigital number, since it uses as much as digits as its factorization.

4742809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 4742809 is about 2177.7991183762. The cubic root of 4742809 is about 168.0138995492.

The spelling of 4742809 in words is "four million, seven hundred forty-two thousand, eight hundred nine".