128994943 has 8 divisors (see below), whose sum is σ = 160824960. Its totient is φ = 100515480.

The previous prime is 128994941. The next prime is 128994949. The reversal of 128994943 is 349499821.

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 128994943 - 2¹ = 128994941 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 (128994941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 837553 + ... + 837706.

It is an arithmetic number, because the mean of its divisors is an integer number (20103120).

Almost surely, 2^128994943 is an apocalyptic number.

128994943 is a deficient number, since it is larger than the sum of its proper divisors (31830017).

128994943 is a wasteful number, since it uses less digits than its factorization.

128994943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1675277.

The product of its digits is 559872, while the sum is 49.

The square root of 128994943 is about 11357.5940674071. The cubic root of 128994943 is about 505.2708320816.

The spelling of 128994943 in words is "one hundred twenty-eight million, nine hundred ninety-four thousand, nine hundred forty-three".