127982209 has 8 divisors (see below), whose sum is σ = 130962600. Its totient is φ = 125030400.

The previous prime is 127982207. The next prime is 127982219. The reversal of 127982209 is 902289721.

It can be written as a sum of positive squares in 4 ways, for example, as 360000 + 127622209 = 600^2 + 11297^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 127982209 - 2¹ = 127982207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127982201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2049 + ... + 16129.

It is an arithmetic number, because the mean of its divisors is an integer number (16370325).

Almost surely, 2^127982209 is an apocalyptic number.

It is an amenable number.

127982209 is a deficient number, since it is larger than the sum of its proper divisors (2980391).

127982209 is a wasteful number, since it uses less digits than its factorization.

127982209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14291.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 127982209 is about 11312.9222131154. The cubic root of 127982209 is about 503.9450696517.

The spelling of 127982209 in words is "one hundred twenty-seven million, nine hundred eighty-two thousand, two hundred nine".