742430209 has 4 divisors (see below), whose sum is σ = 744633604. Its totient is φ = 740226816.

The previous prime is 742430177. The next prime is 742430219. The reversal of 742430209 is 902034247.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 902034247 = 5737 ⋅157231.

It can be written as a sum of positive squares in 2 ways, for example, as 126000625 + 616429584 = 11225^2 + 24828^2 .

It is a cyclic number.

It is not a de Polignac number, because 742430209 - 2⁵ = 742430177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (742430219) 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, 1101192 + ... + 1101865.

It is an arithmetic number, because the mean of its divisors is an integer number (186158401).

Almost surely, 2^742430209 is an apocalyptic number.

It is an amenable number.

742430209 is a deficient number, since it is larger than the sum of its proper divisors (2203395).

742430209 is a wasteful number, since it uses less digits than its factorization.

742430209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2203394.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 742430209 is about 27247.5725340809. The cubic root of 742430209 is about 905.4932382463.

The spelling of 742430209 in words is "seven hundred forty-two million, four hundred thirty thousand, two hundred nine".