27861139 has 2 divisors, whose sum is σ = 27861140. Its totient is φ = 27861138.

The previous prime is 27861103. The next prime is 27861173. The reversal of 27861139 is 93116872.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27861139 - 2¹³ = 27852947 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27861098 and 27861107.

It is not a weakly prime, because it can be changed into another prime (27861179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13930569 + 13930570.

It is an arithmetic number, because the mean of its divisors is an integer number (13930570).

Almost surely, 2^27861139 is an apocalyptic number.

27861139 is a deficient number, since it is larger than the sum of its proper divisors (1).

27861139 is an equidigital number, since it uses as much as digits as its factorization.

27861139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 37.

The square root of 27861139 is about 5278.3651825163. The cubic root of 27861139 is about 303.1560843739.

The spelling of 27861139 in words is "twenty-seven million, eight hundred sixty-one thousand, one hundred thirty-nine".