428791309 has 4 divisors (see below), whose sum is σ = 428849404. Its totient is φ = 428733216.

The previous prime is 428791301. The next prime is 428791327. The reversal of 428791309 is 903197824.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 282139209 + 146652100 = 16797^2 + 12110^2 .

It is a cyclic number.

It is not a de Polignac number, because 428791309 - 2³ = 428791301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428791301) 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, 16032 + ... + 33385.

It is an arithmetic number, because the mean of its divisors is an integer number (107212351).

Almost surely, 2^428791309 is an apocalyptic number.

It is an amenable number.

428791309 is a deficient number, since it is larger than the sum of its proper divisors (58095).

428791309 is an equidigital number, since it uses as much as digits as its factorization.

428791309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58094.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 428791309 is about 20707.2767161691. The cubic root of 428791309 is about 754.0763577518.

The spelling of 428791309 in words is "four hundred twenty-eight million, seven hundred ninety-one thousand, three hundred nine".