27128939 has 2 divisors, whose sum is σ = 27128940. Its totient is φ = 27128938.

The previous prime is 27128929. The next prime is 27128947. The reversal of 27128939 is 93982172.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27128939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27128896 and 27128905.

It is not a weakly prime, because it can be changed into another prime (27128909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13564469 + 13564470.

It is an arithmetic number, because the mean of its divisors is an integer number (13564470).

Almost surely, 2^27128939 is an apocalyptic number.

27128939 is a deficient number, since it is larger than the sum of its proper divisors (1).

27128939 is an equidigital number, since it uses as much as digits as its factorization.

27128939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 41.

The square root of 27128939 is about 5208.5448063735. The cubic root of 27128939 is about 300.4767936764.

The spelling of 27128939 in words is "twenty-seven million, one hundred twenty-eight thousand, nine hundred thirty-nine".