128949009 has 8 divisors (see below), whose sum is σ = 196493760. Its totient is φ = 73685136.

The previous prime is 128949001. The next prime is 128949047. The reversal of 128949009 is 900949821.

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

It is not a de Polignac number, because 128949009 - 2³ = 128949001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128949001) 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, 3070194 + ... + 3070235.

It is an arithmetic number, because the mean of its divisors is an integer number (24561720).

Almost surely, 2^128949009 is an apocalyptic number.

It is an amenable number.

128949009 is a deficient number, since it is larger than the sum of its proper divisors (67544751).

128949009 is an equidigital number, since it uses as much as digits as its factorization.

128949009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6140439.

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 128949009 is about 11355.5717161224. The cubic root of 128949009 is about 505.2108507489.

The spelling of 128949009 in words is "one hundred twenty-eight million, nine hundred forty-nine thousand, nine".