28198139 has 2 divisors, whose sum is σ = 28198140. Its totient is φ = 28198138.

The previous prime is 28198129. The next prime is 28198141. The reversal of 28198139 is 93189182.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28198139 is a prime.

Together with 28198141, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28198096 and 28198105.

It is not a weakly prime, because it can be changed into another prime (28198129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14099069 + 14099070.

It is an arithmetic number, because the mean of its divisors is an integer number (14099070).

Almost surely, 2^28198139 is an apocalyptic number.

28198139 is a deficient number, since it is larger than the sum of its proper divisors (1).

28198139 is an equidigital number, since it uses as much as digits as its factorization.

28198139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 41.

The square root of 28198139 is about 5310.1919927626. The cubic root of 28198139 is about 304.3734841465.

The spelling of 28198139 in words is "twenty-eight million, one hundred ninety-eight thousand, one hundred thirty-nine".