128194039 has 4 divisors (see below), whose sum is σ = 128274840. Its totient is φ = 128113240.

The previous prime is 128193953. The next prime is 128194049. The reversal of 128194039 is 930491821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128194039 - 2⁷ = 128193911 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128193989 and 128194007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128194049) 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, 37972 + ... + 41209.

It is an arithmetic number, because the mean of its divisors is an integer number (32068710).

Almost surely, 2^128194039 is an apocalyptic number.

128194039 is a deficient number, since it is larger than the sum of its proper divisors (80801).

128194039 is an equidigital number, since it uses as much as digits as its factorization.

128194039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80800.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 128194039 is about 11322.2806448171. The cubic root of 128194039 is about 504.2229516137. Note that the first 3 decimals are identical.

The spelling of 128194039 in words is "one hundred twenty-eight million, one hundred ninety-four thousand, thirty-nine".