28940393 has 2 divisors, whose sum is σ = 28940394. Its totient is φ = 28940392.

The previous prime is 28940369. The next prime is 28940399. The reversal of 28940393 is 39304982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20720704 + 8219689 = 4552^2 + 2867^2 .

It is a cyclic number.

It is not a de Polignac number, because 28940393 - 2¹⁰ = 28939369 is a prime.

It is not a weakly prime, because it can be changed into another prime (28940399) 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, 14470196 + 14470197.

It is an arithmetic number, because the mean of its divisors is an integer number (14470197).

Almost surely, 2^28940393 is an apocalyptic number.

It is an amenable number.

28940393 is a deficient number, since it is larger than the sum of its proper divisors (1).

28940393 is an equidigital number, since it uses as much as digits as its factorization.

28940393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 28940393 is about 5379.6275893411. The cubic root of 28940393 is about 307.0210421055.

The spelling of 28940393 in words is "twenty-eight million, nine hundred forty thousand, three hundred ninety-three".