128743469 has 4 divisors (see below), whose sum is σ = 128766396. Its totient is φ = 128720544.

The previous prime is 128743463. The next prime is 128743471. The reversal of 128743469 is 964347821.

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

It can be written as a sum of positive squares in 2 ways, for example, as 94672900 + 34070569 = 9730^2 + 5837^2 .

It is a cyclic number.

It is not a de Polignac number, because 128743469 - 2⁴ = 128743453 is a prime.

It is a super-2 number, since 2×128743469² = 33149761620307922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128743463) 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, 3287 + ... + 16379.

It is an arithmetic number, because the mean of its divisors is an integer number (32191599).

Almost surely, 2^128743469 is an apocalyptic number.

It is an amenable number.

128743469 is a deficient number, since it is larger than the sum of its proper divisors (22927).

128743469 is an equidigital number, since it uses as much as digits as its factorization.

128743469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22926.

The product of its digits is 290304, while the sum is 44.

The square root of 128743469 is about 11346.5179240153. The cubic root of 128743469 is about 504.9422787996.

The spelling of 128743469 in words is "one hundred twenty-eight million, seven hundred forty-three thousand, four hundred sixty-nine".