27126989 has 2 divisors, whose sum is σ = 27126990. Its totient is φ = 27126988.

The previous prime is 27126947. The next prime is 27126997. The reversal of 27126989 is 98962172.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18774889 + 8352100 = 4333^2 + 2890^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27126989 is a prime.

It is a super-2 number, since 2×27126989² = 1471747064412242, 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 (27126929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13563494 + 13563495.

It is an arithmetic number, because the mean of its divisors is an integer number (13563495).

Almost surely, 2^27126989 is an apocalyptic number.

It is an amenable number.

27126989 is a deficient number, since it is larger than the sum of its proper divisors (1).

27126989 is an equidigital number, since it uses as much as digits as its factorization.

27126989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 44.

The square root of 27126989 is about 5208.3576106101. The cubic root of 27126989 is about 300.4695941838.

The spelling of 27126989 in words is "twenty-seven million, one hundred twenty-six thousand, nine hundred eighty-nine".