128049907 has 4 divisors (see below), whose sum is σ = 129488760. Its totient is φ = 126611056.

The previous prime is 128049881. The next prime is 128049917. The reversal of 128049907 is 709940821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128049907 - 2²³ = 119661299 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128049907.

It is not an unprimeable number, because it can be changed into a prime (128049917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 719293 + ... + 719470.

It is an arithmetic number, because the mean of its divisors is an integer number (32372190).

Almost surely, 2^128049907 is an apocalyptic number.

128049907 is a deficient number, since it is larger than the sum of its proper divisors (1438853).

128049907 is an equidigital number, since it uses as much as digits as its factorization.

128049907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1438852.

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

The square root of 128049907 is about 11315.9138826698. The cubic root of 128049907 is about 504.0339102803.

The spelling of 128049907 in words is "one hundred twenty-eight million, forty-nine thousand, nine hundred seven".