428702993 has 2 divisors, whose sum is σ = 428702994. Its totient is φ = 428702992.

The previous prime is 428702983. The next prime is 428703029. The reversal of 428702993 is 399207824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 361266049 + 67436944 = 19007^2 + 8212^2 .

It is a cyclic number.

It is not a de Polignac number, because 428702993 - 2²⁰ = 427654417 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (428702983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214351496 + 214351497.

It is an arithmetic number, because the mean of its divisors is an integer number (214351497).

Almost surely, 2^428702993 is an apocalyptic number.

It is an amenable number.

428702993 is a deficient number, since it is larger than the sum of its proper divisors (1).

428702993 is an equidigital number, since it uses as much as digits as its factorization.

428702993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 428702993 is about 20705.1441192763. The cubic root of 428702993 is about 754.0245830859.

The spelling of 428702993 in words is "four hundred twenty-eight million, seven hundred two thousand, nine hundred ninety-three".