428823709 has 2 divisors, whose sum is σ = 428823710. Its totient is φ = 428823708.

The previous prime is 428823697. The next prime is 428823721. The reversal of 428823709 is 907328824.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (428823697) and next prime (428823721).

It can be written as a sum of positive squares in only one way, i.e., 407636100 + 21187609 = 20190^2 + 4603^2 .

It is a cyclic number.

It is not a de Polignac number, because 428823709 - 2¹¹ = 428821661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428823739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214411854 + 214411855.

It is an arithmetic number, because the mean of its divisors is an integer number (214411855).

Almost surely, 2^428823709 is an apocalyptic number.

It is an amenable number.

428823709 is a deficient number, since it is larger than the sum of its proper divisors (1).

428823709 is an equidigital number, since it uses as much as digits as its factorization.

428823709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 428823709 is about 20708.0590350713. The cubic root of 428823709 is about 754.0953502533.

The spelling of 428823709 in words is "four hundred twenty-eight million, eight hundred twenty-three thousand, seven hundred nine".