128344969 has 4 divisors (see below), whose sum is σ = 129062160. Its totient is φ = 127627780.

The previous prime is 128344949. The next prime is 128344973. The reversal of 128344969 is 969443821.

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, and also an emirpimes, since its reverse is a distinct semiprime: 969443821 = 19 ⋅51023359.

It is a cyclic number.

It is not a de Polignac number, because 128344969 - 2¹³ = 128336777 is a prime.

It is a super-2 number, since 2×128344969² = 32944862135221922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128344949) 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, 358327 + ... + 358684.

It is an arithmetic number, because the mean of its divisors is an integer number (32265540).

Almost surely, 2^128344969 is an apocalyptic number.

It is an amenable number.

128344969 is a deficient number, since it is larger than the sum of its proper divisors (717191).

128344969 is an equidigital number, since it uses as much as digits as its factorization.

128344969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717190.

The product of its digits is 373248, while the sum is 46.

The square root of 128344969 is about 11328.9438607489. The cubic root of 128344969 is about 504.4207572830.

The spelling of 128344969 in words is "one hundred twenty-eight million, three hundred forty-four thousand, nine hundred sixty-nine".