27438989 has 2 divisors, whose sum is σ = 27438990. Its totient is φ = 27438988.

The previous prime is 27438949. The next prime is 27438997. The reversal of 27438989 is 98983472.

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., 21996100 + 5442889 = 4690^2 + 2333^2 .

It is a cyclic number.

It is not a de Polignac number, because 27438989 - 2¹² = 27434893 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27438949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13719494 + 13719495.

It is an arithmetic number, because the mean of its divisors is an integer number (13719495).

Almost surely, 2^27438989 is an apocalyptic number.

It is an amenable number.

27438989 is a deficient number, since it is larger than the sum of its proper divisors (1).

27438989 is an equidigital number, since it uses as much as digits as its factorization.

27438989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 50.

The square root of 27438989 is about 5238.2238401962. The cubic root of 27438989 is about 301.6171522503.

The spelling of 27438989 in words is "twenty-seven million, four hundred thirty-eight thousand, nine hundred eighty-nine".