27388989 has 16 divisors (see below), whose sum is σ = 42963840. Its totient is φ = 17184960.

The previous prime is 27388981. The next prime is 27388993. The reversal of 27388989 is 98988372.

It is not a de Polignac number, because 27388989 - 2³ = 27388981 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27388981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29377 + ... + 30294.

It is an arithmetic number, because the mean of its divisors is an integer number (2685240).

Almost surely, 2^27388989 is an apocalyptic number.

It is an amenable number.

27388989 is a deficient number, since it is larger than the sum of its proper divisors (15574851).

27388989 is a wasteful number, since it uses less digits than its factorization.

27388989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59697 (or 59691 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The square root of 27388989 is about 5233.4490539223. The cubic root of 27388989 is about 301.4338361287.

The spelling of 27388989 in words is "twenty-seven million, three hundred eighty-eight thousand, nine hundred eighty-nine".