128376209 has 8 divisors (see below), whose sum is σ = 138805632. Its totient is φ = 118026000.

The previous prime is 128376203. The next prime is 128376211. The reversal of 128376209 is 902673821.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128376209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128376203) 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, 16409 + ... + 22934.

It is an arithmetic number, because the mean of its divisors is an integer number (17350704).

Almost surely, 2^128376209 is an apocalyptic number.

It is an amenable number.

128376209 is a deficient number, since it is larger than the sum of its proper divisors (10429423).

128376209 is a wasteful number, since it uses less digits than its factorization.

128376209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39607.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 128376209 is about 11330.3225461590. The cubic root of 128376209 is about 504.4616803937.

The spelling of 128376209 in words is "one hundred twenty-eight million, three hundred seventy-six thousand, two hundred nine".