27145639 has 2 divisors, whose sum is σ = 27145640. Its totient is φ = 27145638.

The previous prime is 27145637. The next prime is 27145667. The reversal of 27145639 is 93654172.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27145639 - 2¹ = 27145637 is a prime.

Together with 27145637, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 27145598 and 27145607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27145637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13572819 + 13572820.

It is an arithmetic number, because the mean of its divisors is an integer number (13572820).

Almost surely, 2^27145639 is an apocalyptic number.

27145639 is a deficient number, since it is larger than the sum of its proper divisors (1).

27145639 is an equidigital number, since it uses as much as digits as its factorization.

27145639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 37.

The square root of 27145639 is about 5210.1476946436. The cubic root of 27145639 is about 300.5384367451.

The spelling of 27145639 in words is "twenty-seven million, one hundred forty-five thousand, six hundred thirty-nine".