28939369 has 2 divisors, whose sum is σ = 28939370. Its totient is φ = 28939368.

The previous prime is 28939343. The next prime is 28939381. The reversal of 28939369 is 96393982.

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., 23155344 + 5784025 = 4812^2 + 2405^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28939369 is a prime.

It is a super-2 number, since 2×28939369² = 1674974156236322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28931369) 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, 14469684 + 14469685.

It is an arithmetic number, because the mean of its divisors is an integer number (14469685).

Almost surely, 2^28939369 is an apocalyptic number.

It is an amenable number.

28939369 is a deficient number, since it is larger than the sum of its proper divisors (1).

28939369 is an equidigital number, since it uses as much as digits as its factorization.

28939369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 629856, while the sum is 49.

The square root of 28939369 is about 5379.5324146249. The cubic root of 28939369 is about 307.0174209469.

The spelling of 28939369 in words is "twenty-eight million, nine hundred thirty-nine thousand, three hundred sixty-nine".