128399173 has 8 divisors (see below), whose sum is σ = 147213248. Its totient is φ = 109702944.

The previous prime is 128399171. The next prime is 128399209. The reversal of 128399173 is 371993821.

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 128399173 - 2¹ = 128399171 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128399171) 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, 27111 + ... + 31492.

It is an arithmetic number, because the mean of its divisors is an integer number (18401656).

Almost surely, 2^128399173 is an apocalyptic number.

It is an amenable number.

128399173 is a deficient number, since it is larger than the sum of its proper divisors (18814075).

128399173 is an equidigital number, since it uses as much as digits as its factorization.

128399173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58923.

The product of its digits is 81648, while the sum is 43.

The square root of 128399173 is about 11331.3358877054. The cubic root of 128399173 is about 504.4917580522.

The spelling of 128399173 in words is "one hundred twenty-eight million, three hundred ninety-nine thousand, one hundred seventy-three".