128385172 has 12 divisors (see below), whose sum is σ = 234442656. Its totient is φ = 61401560.

The previous prime is 128385163. The next prime is 128385181. The reversal of 128385172 is 271583821.

It is an interprime number because it is at equal distance from previous prime (128385163) and next prime (128385181).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 697654 + ... + 697837.

It is an arithmetic number, because the mean of its divisors is an integer number (19536888).

Almost surely, 2^128385172 is an apocalyptic number.

It is an amenable number.

128385172 is a deficient number, since it is larger than the sum of its proper divisors (106057484).

128385172 is a wasteful number, since it uses less digits than its factorization.

128385172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1395518 (or 1395516 counting only the distinct ones).

The product of its digits is 26880, while the sum is 37.

The square root of 128385172 is about 11330.7180708020. The cubic root of 128385172 is about 504.4734203281.

The spelling of 128385172 in words is "one hundred twenty-eight million, three hundred eighty-five thousand, one hundred seventy-two".