428038693 has 2 divisors, whose sum is σ = 428038694. Its totient is φ = 428038692.

The previous prime is 428038673. The next prime is 428038697. The reversal of 428038693 is 396830824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 418693444 + 9345249 = 20462^2 + 3057^2 .

It is a cyclic number.

It is not a de Polignac number, because 428038693 - 2⁹ = 428038181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428038697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214019346 + 214019347.

It is an arithmetic number, because the mean of its divisors is an integer number (214019347).

Almost surely, 2^428038693 is an apocalyptic number.

It is an amenable number.

428038693 is a deficient number, since it is larger than the sum of its proper divisors (1).

428038693 is an equidigital number, since it uses as much as digits as its factorization.

428038693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 43.

The square root of 428038693 is about 20689.0959928171. The cubic root of 428038693 is about 753.6349135591.

The spelling of 428038693 in words is "four hundred twenty-eight million, thirty-eight thousand, six hundred ninety-three".