428329309 has 2 divisors, whose sum is σ = 428329310. Its totient is φ = 428329308.

The previous prime is 428329303. The next prime is 428329313. The reversal of 428329309 is 903923824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 425596900 + 2732409 = 20630^2 + 1653^2 .

It is a cyclic number.

It is not a de Polignac number, because 428329309 - 2³ = 428329301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428329301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214164654 + 214164655.

It is an arithmetic number, because the mean of its divisors is an integer number (214164655).

Almost surely, 2^428329309 is an apocalyptic number.

It is an amenable number.

428329309 is a deficient number, since it is larger than the sum of its proper divisors (1).

428329309 is an equidigital number, since it uses as much as digits as its factorization.

428329309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 428329309 is about 20696.1182109110. The cubic root of 428329309 is about 753.8054346039.

The spelling of 428329309 in words is "four hundred twenty-eight million, three hundred twenty-nine thousand, three hundred nine".