27642919 has 2 divisors, whose sum is σ = 27642920. Its totient is φ = 27642918.

The previous prime is 27642911. The next prime is 27642931. The reversal of 27642919 is 91924672.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27642919 - 2³ = 27642911 is a prime.

It is a super-2 number, since 2×27642919² = 1528261941681122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27642911) 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, 13821459 + 13821460.

It is an arithmetic number, because the mean of its divisors is an integer number (13821460).

Almost surely, 2^27642919 is an apocalyptic number.

27642919 is a deficient number, since it is larger than the sum of its proper divisors (1).

27642919 is an equidigital number, since it uses as much as digits as its factorization.

27642919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 40.

The square root of 27642919 is about 5257.6533738922. The cubic root of 27642919 is about 302.3625275215.

It can be divided in two parts, 27642 and 919, that added together give a 4-th power (28561 = 13⁴).

The spelling of 27642919 in words is "twenty-seven million, six hundred forty-two thousand, nine hundred nineteen".