27858139 has 2 divisors, whose sum is σ = 27858140. Its totient is φ = 27858138.

The previous prime is 27858113. The next prime is 27858143. The reversal of 27858139 is 93185872.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27858139 - 2⁵ = 27858107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27858095 and 27858104.

It is not a weakly prime, because it can be changed into another prime (27858839) 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, 13929069 + 13929070.

It is an arithmetic number, because the mean of its divisors is an integer number (13929070).

Almost surely, 2^27858139 is an apocalyptic number.

27858139 is a deficient number, since it is larger than the sum of its proper divisors (1).

27858139 is an equidigital number, since it uses as much as digits as its factorization.

27858139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 43.

The square root of 27858139 is about 5278.0809959681. The cubic root of 27858139 is about 303.1452030181.

The spelling of 27858139 in words is "twenty-seven million, eight hundred fifty-eight thousand, one hundred thirty-nine".