27690139 has 2 divisors, whose sum is σ = 27690140. Its totient is φ = 27690138.

The previous prime is 27690107. The next prime is 27690149. The reversal of 27690139 is 93109672.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27690139 - 2⁵ = 27690107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27690098 and 27690107.

It is not a weakly prime, because it can be changed into another prime (27690149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13845069 + 13845070.

It is an arithmetic number, because the mean of its divisors is an integer number (13845070).

Almost surely, 2^27690139 is an apocalyptic number.

27690139 is a deficient number, since it is larger than the sum of its proper divisors (1).

27690139 is an equidigital number, since it uses as much as digits as its factorization.

27690139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 27690139 is about 5262.1420543349. The cubic root of 27690139 is about 302.5345961388.

The spelling of 27690139 in words is "twenty-seven million, six hundred ninety thousand, one hundred thirty-nine".