128535973 has 4 divisors (see below), whose sum is σ = 128731680. Its totient is φ = 128340268.

The previous prime is 128535919. The next prime is 128536027. The reversal of 128535973 is 379535821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (128535919) and next prime (128536027).

It is a cyclic number.

It is not a de Polignac number, because 128535973 - 2⁹ = 128535461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128535073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96865 + ... + 98182.

It is an arithmetic number, because the mean of its divisors is an integer number (32182920).

Almost surely, 2^128535973 is an apocalyptic number.

It is an amenable number.

128535973 is a deficient number, since it is larger than the sum of its proper divisors (195707).

128535973 is an equidigital number, since it uses as much as digits as its factorization.

128535973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195706.

The product of its digits is 226800, while the sum is 43.

The square root of 128535973 is about 11337.3706387328. The cubic root of 128535973 is about 504.6708609115.

The spelling of 128535973 in words is "one hundred twenty-eight million, five hundred thirty-five thousand, nine hundred seventy-three".