128398955 has 8 divisors (see below), whose sum is σ = 154395504. Its totient is φ = 102508000.

The previous prime is 128398891. The next prime is 128398969. The reversal of 128398955 is 559893821.

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

It is not a de Polignac number, because 128398955 - 2⁶ = 128398891 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23696 + ... + 28605.

It is an arithmetic number, because the mean of its divisors is an integer number (19299438).

Almost surely, 2^128398955 is an apocalyptic number.

128398955 is a deficient number, since it is larger than the sum of its proper divisors (25996549).

128398955 is an equidigital number, since it uses as much as digits as its factorization.

128398955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52797.

The product of its digits is 777600, while the sum is 50.

The square root of 128398955 is about 11331.3262683589. The cubic root of 128398955 is about 504.4914725383.

The spelling of 128398955 in words is "one hundred twenty-eight million, three hundred ninety-eight thousand, nine hundred fifty-five".