28189393 has 2 divisors, whose sum is σ = 28189394. Its totient is φ = 28189392.

The previous prime is 28189309. The next prime is 28189409. The reversal of 28189393 is 39398182.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25522704 + 2666689 = 5052^2 + 1633^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28189393 is a prime.

It is not a weakly prime, because it can be changed into another prime (28189493) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14094696 + 14094697.

It is an arithmetic number, because the mean of its divisors is an integer number (14094697).

Almost surely, 2^28189393 is an apocalyptic number.

It is an amenable number.

28189393 is a deficient number, since it is larger than the sum of its proper divisors (1).

28189393 is an equidigital number, since it uses as much as digits as its factorization.

28189393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 43.

The square root of 28189393 is about 5309.3684181831. The cubic root of 28189393 is about 304.3420124979.

It can be divided in two parts, 28189 and 393, that added together give a palindrome (28582).

The spelling of 28189393 in words is "twenty-eight million, one hundred eighty-nine thousand, three hundred ninety-three".