128015409 has 8 divisors (see below), whose sum is σ = 170754912. Its totient is φ = 85309760.

The previous prime is 128015347. The next prime is 128015417. The reversal of 128015409 is 904510821.

It is a happy number.

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 128015409 - 2⁷ = 128015281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128014409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2329 + ... + 16169.

It is an arithmetic number, because the mean of its divisors is an integer number (21344364).

Almost surely, 2^128015409 is an apocalyptic number.

It is an amenable number.

128015409 is a deficient number, since it is larger than the sum of its proper divisors (42739503).

128015409 is a wasteful number, since it uses less digits than its factorization.

128015409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16927.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 128015409 is about 11314.3894665156. The cubic root of 128015409 is about 503.9886421918.

The spelling of 128015409 in words is "one hundred twenty-eight million, fifteen thousand, four hundred nine".