128484921 has 8 divisors (see below), whose sum is σ = 171449920. Its totient is φ = 85588272.

The previous prime is 128484899. The next prime is 128484953. The reversal of 128484921 is 129484821.

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

It is not a de Polignac number, because 128484921 - 2⁹ = 128484409 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 128484921.

It is not an unprimeable number, because it can be changed into a prime (128484991) 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, 12526 + ... + 20343.

It is an arithmetic number, because the mean of its divisors is an integer number (21431240).

Almost surely, 2^128484921 is an apocalyptic number.

It is an amenable number.

128484921 is a deficient number, since it is larger than the sum of its proper divisors (42964999).

128484921 is a wasteful number, since it uses less digits than its factorization.

128484921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34175.

The product of its digits is 36864, while the sum is 39.

The square root of 128484921 is about 11335.1189230638. The cubic root of 128484921 is about 504.6040368985.

The spelling of 128484921 in words is "one hundred twenty-eight million, four hundred eighty-four thousand, nine hundred twenty-one".