428681999 has 2 divisors, whose sum is σ = 428682000. Its totient is φ = 428681998.

The previous prime is 428681947. The next prime is 428682071. The reversal of 428681999 is 999186824.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 428681999 - 2¹² = 428677903 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428681899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214340999 + 214341000.

It is an arithmetic number, because the mean of its divisors is an integer number (214341000).

Almost surely, 2^428681999 is an apocalyptic number.

428681999 is a deficient number, since it is larger than the sum of its proper divisors (1).

428681999 is an equidigital number, since it uses as much as digits as its factorization.

428681999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2239488, while the sum is 56.

The square root of 428681999 is about 20704.6371376076. The cubic root of 428681999 is about 754.0122744474.

The spelling of 428681999 in words is "four hundred twenty-eight million, six hundred eighty-one thousand, nine hundred ninety-nine".