128440245 has 8 divisors (see below), whose sum is σ = 205504416. Its totient is φ = 68501456.

The previous prime is 128440231. The next prime is 128440267. The reversal of 128440245 is 542044821.

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 128440245 - 2⁴ = 128440229 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4281327 + ... + 4281356.

It is an arithmetic number, because the mean of its divisors is an integer number (25688052).

Almost surely, 2^128440245 is an apocalyptic number.

128440245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128440245 is a deficient number, since it is larger than the sum of its proper divisors (77064171).

128440245 is an equidigital number, since it uses as much as digits as its factorization.

128440245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8562691.

The product of its (nonzero) digits is 10240, while the sum is 30.

The square root of 128440245 is about 11333.1480622111. The cubic root of 128440245 is about 504.5455441633.

The spelling of 128440245 in words is "one hundred twenty-eight million, four hundred forty thousand, two hundred forty-five".