28389929 has 2 divisors, whose sum is σ = 28389930. Its totient is φ = 28389928.

The previous prime is 28389923. The next prime is 28389931. The reversal of 28389929 is 92998382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21603904 + 6786025 = 4648^2 + 2605^2 .

It is a cyclic number.

It is not a de Polignac number, because 28389929 - 2¹⁶ = 28324393 is a prime.

Together with 28389931, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28389923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14194964 + 14194965.

It is an arithmetic number, because the mean of its divisors is an integer number (14194965).

Almost surely, 2^28389929 is an apocalyptic number.

It is an amenable number.

28389929 is a deficient number, since it is larger than the sum of its proper divisors (1).

28389929 is an equidigital number, since it uses as much as digits as its factorization.

28389929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 50.

The square root of 28389929 is about 5328.2200592693. The cubic root of 28389929 is about 305.0619922364.

The spelling of 28389929 in words is "twenty-eight million, three hundred eighty-nine thousand, nine hundred twenty-nine".